21250024220000 has 60 divisors (see below), whose sum is σ = 52278247134036. Its totient is φ = 8500009680000.

The previous prime is 21250024219997. The next prime is 21250024220021. The reversal of 21250024220000 is 2242005212.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 531230606 + ... + 531270605.

Almost surely, 2^{21250024220000} is an apocalyptic number.

21250024220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21250024220000 is an abundant number, since it is smaller than the sum of its proper divisors (31028222914036).

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

21250024220000 is an equidigital number, since it uses as much as digits as its factorization.

21250024220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062501241 (or 1062501218 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 21250024220000 its reverse (2242005212), we get a palindrome (21252266225212).

The spelling of 21250024220000 in words is "twenty-one trillion, two hundred fifty billion, twenty-four million, two hundred twenty thousand".