21349672 has 32 divisors (see below), whose sum is σ = 41770080. Its totient is φ = 10221120.

The previous prime is 21349667. The next prime is 21349687. The reversal of 21349672 is 27694312.

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, 17647 + ... + 18817.

It is an arithmetic number, because the mean of its divisors is an integer number (1305315).

Almost surely, 2^21349672 is an apocalyptic number.

It is an amenable number.

21349672 is a deficient number, since it is larger than the sum of its proper divisors (20420408).

21349672 is a wasteful number, since it uses less digits than its factorization.

21349672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1269 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21349672 is about 4620.5705275431. The cubic root of 21349672 is about 277.4152954145.

The spelling of 21349672 in words is "twenty-one million, three hundred forty-nine thousand, six hundred seventy-two".