21152666251612 has 24 divisors (see below), whose sum is σ = 43448719870304. Its totient is φ = 8820416814912.

The previous prime is 21152666251603. The next prime is 21152666251669. The reversal of 21152666251612 is 21615266625112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10208814723 + ... + 10208816794.

Almost surely, 2^{21152666251612} is an apocalyptic number.

It is an amenable number.

21152666251612 is an abundant number, since it is smaller than the sum of its proper divisors (22296053618692).

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

21152666251612 is a wasteful number, since it uses less digits than its factorization.

21152666251612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20417631565 (or 20417631563 counting only the distinct ones).

The product of its digits is 518400, while the sum is 46.

The spelling of 21152666251612 in words is "twenty-one trillion, one hundred fifty-two billion, six hundred sixty-six million, two hundred fifty-one thousand, six hundred twelve".