1102121220 has 384 divisors, whose sum is σ = 3723148800. Its totient is φ = 241532928.

The previous prime is 1102121173. The next prime is 1102121243. The reversal of 1102121220 is 221212011.

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 = 1102121196 and 1102121205.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 20794714 + ... + 20794766.

It is an arithmetic number, because the mean of its divisors is an integer number (9695700).

Almost surely, 2^1102121220 is an apocalyptic number.

1102121220 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 1102121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1861574400).

1102121220 is an abundant number, since it is smaller than the sum of its proper divisors (2621027580).

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

1102121220 is a wasteful number, since it uses less digits than its factorization.

1102121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1102121220 is about 33198.2110963829. The cubic root of 1102121220 is about 1032.9432327930.

Adding to 1102121220 its reverse (221212011), we get a palindrome (1323333231).

The spelling of 1102121220 in words is "one billion, one hundred two million, one hundred twenty-one thousand, two hundred twenty".