21335532872 has 32 divisors (see below), whose sum is σ = 42531065280. Its totient is φ = 10011418560.

The previous prime is 21335532871. The next prime is 21335532893. The reversal of 21335532872 is 27823553312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21335532871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1084154 + ... + 1103657.

It is an arithmetic number, because the mean of its divisors is an integer number (1329095790).

Almost surely, 2^21335532872 is an apocalyptic number.

It is an amenable number.

21335532872 is a deficient number, since it is larger than the sum of its proper divisors (21195532408).

21335532872 is a wasteful number, since it uses less digits than its factorization.

21335532872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2187893 (or 2187889 counting only the distinct ones).

The product of its digits is 302400, while the sum is 41.

The spelling of 21335532872 in words is "twenty-one billion, three hundred thirty-five million, five hundred thirty-two thousand, eight hundred seventy-two".