21251065003224 has 64 divisors (see below), whose sum is σ = 60745662474240. Its totient is φ = 6068899468800.

The previous prime is 21251065003219. The next prime is 21251065003229. The reversal of 21251065003224 is 42230056015212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21251065003219) and next prime (21251065003229).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21251065003229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29153377 + ... + 29873424.

It is an arithmetic number, because the mean of its divisors is an integer number (949150976160).

Almost surely, 2^{21251065003224} is an apocalyptic number.

21251065003224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21251065003224 is an abundant number, since it is smaller than the sum of its proper divisors (39494597471016).

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

21251065003224 is a wasteful number, since it uses less digits than its factorization.

21251065003224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59028960 (or 59028956 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 21251065003224 in words is "twenty-one trillion, two hundred fifty-one billion, sixty-five million, three thousand, two hundred twenty-four".