21451907472 has 40 divisors (see below), whose sum is σ = 55433832960. Its totient is φ = 7148519040.

The previous prime is 21451907437. The next prime is 21451907539. The reversal of 21451907472 is 27470915412.

It is a super-3 number, since 3×21451907472³ (a number of 32 digits) contains 333 as substring.

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, 102097 + ... + 230927.

It is an arithmetic number, because the mean of its divisors is an integer number (1385845824).

Almost surely, 2^21451907472 is an apocalyptic number.

It is an amenable number.

21451907472 is an abundant number, since it is smaller than the sum of its proper divisors (33981925488).

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

21451907472 is a wasteful number, since it uses less digits than its factorization.

21451907472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132311 (or 132305 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21451907472 in words is "twenty-one billion, four hundred fifty-one million, nine hundred seven thousand, four hundred seventy-two".