121011220 has 48 divisors (see below), whose sum is σ = 278002368. Its totient is φ = 43880960.

The previous prime is 121011199. The next prime is 121011223. The reversal of 121011220 is 22110121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121011197 and 121011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123372 + ... + 124348.

It is an arithmetic number, because the mean of its divisors is an integer number (5791716).

Almost surely, 2^121011220 is an apocalyptic number.

121011220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121011220 is an abundant number, since it is smaller than the sum of its proper divisors (156991148).

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

121011220 is a wasteful number, since it uses less digits than its factorization.

121011220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560 (or 1558 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121011220 is about 11000.5099881778. The cubic root of 121011220 is about 494.6240317590.

Adding to 121011220 its reverse (22110121), we get a palindrome (143121341).

The spelling of 121011220 in words is "one hundred twenty-one million, eleven thousand, two hundred twenty".