1210021120 has 144 divisors (see below), whose sum is σ = 3613857408. Its totient is φ = 377118720.

The previous prime is 1210021093. The next prime is 1210021133. The reversal of 1210021120 is 211200121.

It is a super-2 number, since 2×1210021120² = 2928302221692108800, which contains 22 as substring.

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 = 1210021097 and 1210021106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92422 + ... + 104698.

It is an arithmetic number, because the mean of its divisors is an integer number (25096232).

Almost surely, 2^1210021120 is an apocalyptic number.

1210021120 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 1210021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1806928704).

1210021120 is an abundant number, since it is smaller than the sum of its proper divisors (2403836288).

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

1210021120 is a wasteful number, since it uses less digits than its factorization.

1210021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12316 (or 12302 counting only the distinct ones).

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

The square root of 1210021120 is about 34785.3578391829. The cubic root of 1210021120 is about 1065.6084365981.

Adding to 1210021120 its reverse (211200121), we get a palindrome (1421221241).

The spelling of 1210021120 in words is "one billion, two hundred ten million, twenty-one thousand, one hundred twenty".