21507526134444 has 24 divisors (see below), whose sum is σ = 57353403025408. Its totient is φ = 6145007466960.

The previous prime is 21507526134439. The next prime is 21507526134463. The reversal of 21507526134444 is 44443162570512.

It is a junction number, because it is equal to n+sod(n) for n = 21507526134393 and 21507526134402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128020988812 + ... + 128020988979.

Almost surely, 2^{21507526134444} is an apocalyptic number.

It is an amenable number.

21507526134444 is an abundant number, since it is smaller than the sum of its proper divisors (35845876890964).

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

21507526134444 is a wasteful number, since it uses less digits than its factorization.

21507526134444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256041977805 (or 256041977803 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 48.

The spelling of 21507526134444 in words is "twenty-one trillion, five hundred seven billion, five hundred twenty-six million, one hundred thirty-four thousand, four hundred forty-four".