21250241126564 has 24 divisors (see below), whose sum is σ = 38396263734528. Its totient is φ = 10280035977120.

The previous prime is 21250241126561. The next prime is 21250241126591. The reversal of 21250241126564 is 46562114205212.

It is a super-2 number, since 2×21250241126564² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21250241126561) 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, 18942254 + ... + 20032709.

It is an arithmetic number, because the mean of its divisors is an integer number (1599844322272).

Almost surely, 2^{21250241126564} is an apocalyptic number.

It is an amenable number.

21250241126564 is a deficient number, since it is larger than the sum of its proper divisors (17146022607964).

21250241126564 is a wasteful number, since it uses less digits than its factorization.

21250241126564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38979395 (or 38979393 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 21250241126564 in words is "twenty-one trillion, two hundred fifty billion, two hundred forty-one million, one hundred twenty-six thousand, five hundred sixty-four".