1210021121956 has 24 divisors (see below), whose sum is σ = 2178008918624. Its totient is φ = 587878663680.

The previous prime is 1210021121941. The next prime is 1210021121957. The reversal of 1210021121956 is 6591211200121.

It is a super-2 number, since 2×1210021121956² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1210021121957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18192210 + ... + 18258601.

Almost surely, 2^{1210021121956} is an apocalyptic number.

It is an amenable number.

1210021121956 is a deficient number, since it is larger than the sum of its proper divisors (967987796668).

1210021121956 is a wasteful number, since it uses less digits than its factorization.

1210021121956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36451051 (or 36451049 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 31.

The spelling of 1210021121956 in words is "one trillion, two hundred ten billion, twenty-one million, one hundred twenty-one thousand, nine hundred fifty-six".