21531455325012 has 24 divisors (see below), whose sum is σ = 50257884448800. Its totient is φ = 7174605771616.

The previous prime is 21531455325011. The next prime is 21531455325071. The reversal of 21531455325012 is 21052355413512.

It is a super-2 number, since 2×21531455325012² (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 (21531455325011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318215187 + ... + 318282842.

It is an arithmetic number, because the mean of its divisors is an integer number (2094078518700).

Almost surely, 2^{21531455325012} is an apocalyptic number.

It is an amenable number.

21531455325012 is an abundant number, since it is smaller than the sum of its proper divisors (28726429123788).

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

21531455325012 is a wasteful number, since it uses less digits than its factorization.

21531455325012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636500855 (or 636500853 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 21531455325012 in words is "twenty-one trillion, five hundred thirty-one billion, four hundred fifty-five million, three hundred twenty-five thousand, twelve".