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BaseRepresentation
bin1110011100110…
…10110001111100
322110002121212210
413032122301330
5222013021340
620010100420
73001232502
oct716326174
9273077783
10121220220
1162475600
123471a710
131c163454
1412156672
15a997180
hex739ac7c

121220220 has 144 divisors (see below), whose sum is σ = 380741760. Its totient is φ = 28786560.

The previous prime is 121220213. The next prime is 121220243. The reversal of 121220220 is 22022121.

Adding to 121220220 its reverse (22022121), we get a palindrome (143242341).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121220196 and 121220205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 428199 + ... + 428481.

It is an arithmetic number, because the mean of its divisors is an integer number (2644040).

Almost surely, 2121220220 is an apocalyptic number.

121220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190370880).

121220220 is an abundant number, since it is smaller than the sum of its proper divisors (259521540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220220 is a wasteful number, since it uses less digits than its factorization.

121220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 121220220 is about 11010.0054495899. The cubic root of 121220220 is about 494.9086251089.

The spelling of 121220220 in words is "one hundred twenty-one million, two hundred twenty thousand, two hundred twenty".