1256216113020 has 96 divisors (see below), whose sum is σ = 3960948934656. Its totient is φ = 294713452800.

The previous prime is 1256216112929. The next prime is 1256216113021. The reversal of 1256216113020 is 203116126521.

It is a super-2 number, since 2×1256216113020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256216113021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30678859 + ... + 30719778.

It is an arithmetic number, because the mean of its divisors is an integer number (41259884736).

Almost surely, 2^{1256216113020} is an apocalyptic number.

1256216113020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256216113020 is an abundant number, since it is smaller than the sum of its proper divisors (2704732821636).

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

1256216113020 is a wasteful number, since it uses less digits than its factorization.

1256216113020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61398691 (or 61398689 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 1256216113020 in words is "one trillion, two hundred fifty-six billion, two hundred sixteen million, one hundred thirteen thousand, twenty".