21250225042464 has 192 divisors, whose sum is σ = 65803407409152. Its totient is φ = 5931719577600.

The previous prime is 21250225042463. The next prime is 21250225042471. The reversal of 21250225042464 is 46424052205212.

21250225042464 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×21250225042464² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21250225042463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11749072 + ... + 13436559.

It is an arithmetic number, because the mean of its divisors is an integer number (342726080256).

Almost surely, 2^{21250225042464} is an apocalyptic number.

21250225042464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21250225042464 is an abundant number, since it is smaller than the sum of its proper divisors (44553182366688).

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

21250225042464 is a wasteful number, since it uses less digits than its factorization.

21250225042464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25185719 (or 25185711 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 39.

Adding to 21250225042464 its reverse (46424052205212), we get a palindrome (67674277247676).

The spelling of 21250225042464 in words is "twenty-one trillion, two hundred fifty billion, two hundred twenty-five million, forty-two thousand, four hundred sixty-four".