21957522575912 has 128 divisors (see below), whose sum is σ = 52302253132800. Its totient is φ = 8394183283200.

The previous prime is 21957522575909. The next prime is 21957522575999.

21957522575912 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5653283 + ... + 8710605.

It is an arithmetic number, because the mean of its divisors is an integer number (408611352600).

Almost surely, 2^{21957522575912} is an apocalyptic number.

21957522575912 is a gapful number since it is divisible by the number (22) 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 21957522575912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26151126566400).

21957522575912 is an abundant number, since it is smaller than the sum of its proper divisors (30344730556888).

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

21957522575912 is a wasteful number, since it uses less digits than its factorization.

21957522575912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057567 (or 3057563 counting only the distinct ones).

The product of its digits is 39690000, while the sum is 62.

The spelling of 21957522575912 in words is "twenty-one trillion, nine hundred fifty-seven billion, five hundred twenty-two million, five hundred seventy-five thousand, nine hundred twelve".