21250252646530 has 64 divisors (see below), whose sum is σ = 40596274033920. Its totient is φ = 7991494004736.

The previous prime is 21250252646521. The next prime is 21250252646549. The reversal of 21250252646530 is 3564625205212.

It is a super-5 number, since 5×21250252646530⁵ (a number of 68 digits) contains 55555 as substring.

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, 90435274 + ... + 90669946.

It is an arithmetic number, because the mean of its divisors is an integer number (634316781780).

Almost surely, 2^{21250252646530} is an apocalyptic number.

21250252646530 is a deficient number, since it is larger than the sum of its proper divisors (19346021387390).

21250252646530 is a wasteful number, since it uses less digits than its factorization.

21250252646530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241435.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 21250252646530 in words is "twenty-one trillion, two hundred fifty billion, two hundred fifty-two million, six hundred forty-six thousand, five hundred thirty".