21507007246672 has 40 divisors (see below), whose sum is σ = 43016364054272. Its totient is φ = 10406047968000.

The previous prime is 21507007246651. The next prime is 21507007246691. The reversal of 21507007246672 is 27664270070512.

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, 7976668 + ... + 10326724.

Almost surely, 2^{21507007246672} is an apocalyptic number.

It is an amenable number.

21507007246672 is an abundant number, since it is smaller than the sum of its proper divisors (21509356807600).

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

21507007246672 is a wasteful number, since it uses less digits than its factorization.

21507007246672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2368547 (or 2368541 counting only the distinct ones).

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 21507007246672 in words is "twenty-one trillion, five hundred seven billion, seven million, two hundred forty-six thousand, six hundred seventy-two".