21216042056152 has 8 divisors (see below), whose sum is σ = 39780078855300. Its totient is φ = 10608021028072.

The previous prime is 21216042056117. The next prime is 21216042056177. The reversal of 21216042056152 is 25165024061212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1326002628502 + ... + 1326002628517.

Almost surely, 2^{21216042056152} is an apocalyptic number.

It is an amenable number.

21216042056152 is a deficient number, since it is larger than the sum of its proper divisors (18564036799148).

21216042056152 is a wasteful number, since it uses less digits than its factorization.

21216042056152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2652005257025 (or 2652005257021 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 21216042056152 in words is "twenty-one trillion, two hundred sixteen billion, forty-two million, fifty-six thousand, one hundred fifty-two".