21250241230656 has 56 divisors (see below), whose sum is σ = 56457893793664. Its totient is φ = 7054021969920.

The previous prime is 21250241230651. The next prime is 21250241230703. The reversal of 21250241230656 is 65603214205212.

It is a super-2 number, since 2×21250241230656² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250241230651) 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, 229576840 + ... + 229669383.

Almost surely, 2^{21250241230656} is an apocalyptic number.

It is an amenable number.

21250241230656 is an abundant number, since it is smaller than the sum of its proper divisors (35207652563008).

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

21250241230656 is a wasteful number, since it uses less digits than its factorization.

21250241230656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459246479 (or 459246469 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 21250241230656 its reverse (65603214205212), we get a palindrome (86853455435868).

The spelling of 21250241230656 in words is "twenty-one trillion, two hundred fifty billion, two hundred forty-one million, two hundred thirty thousand, six hundred fifty-six".