21067552072 has 32 divisors (see below), whose sum is σ = 45149918400. Its totient is φ = 9027918144.

The previous prime is 21067552069. The next prime is 21067552081. The reversal of 21067552072 is 27025576012.

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, 667954 + ... + 698782.

It is an arithmetic number, because the mean of its divisors is an integer number (1410934950).

Almost surely, 2^21067552072 is an apocalyptic number.

It is an amenable number.

21067552072 is an abundant number, since it is smaller than the sum of its proper divisors (24082366328).

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

21067552072 is a wasteful number, since it uses less digits than its factorization.

21067552072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43045 (or 43041 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 37.

The spelling of 21067552072 in words is "twenty-one billion, sixty-seven million, five hundred fifty-two thousand, seventy-two".