21471937372 has 6 divisors (see below), whose sum is σ = 37575890408. Its totient is φ = 10735968684.

The previous prime is 21471937369. The next prime is 21471937381. The reversal of 21471937372 is 27373917412.

It is a super-2 number, since 2×21471937372² (a number of 21 digits) contains 22 as substring.

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, 2683992168 + ... + 2683992175.

Almost surely, 2^21471937372 is an apocalyptic number.

It is an amenable number.

21471937372 is a deficient number, since it is larger than the sum of its proper divisors (16103953036).

21471937372 is a wasteful number, since it uses less digits than its factorization.

21471937372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5367984347 (or 5367984345 counting only the distinct ones).

The product of its digits is 444528, while the sum is 46.

The spelling of 21471937372 in words is "twenty-one billion, four hundred seventy-one million, nine hundred thirty-seven thousand, three hundred seventy-two".