21007364 has 24 divisors (see below), whose sum is σ = 42551040. Its totient is φ = 8888256.

The previous prime is 21007321. The next prime is 21007423. The reversal of 21007364 is 46370012.

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, 2537 + ... + 6960.

It is an arithmetic number, because the mean of its divisors is an integer number (1772960).

Almost surely, 2^21007364 is an apocalyptic number.

It is an amenable number.

21007364 is an abundant number, since it is smaller than the sum of its proper divisors (21543676).

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

21007364 is a wasteful number, since it uses less digits than its factorization.

21007364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9587 (or 9585 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21007364 is about 4583.3791028018. The cubic root of 21007364 is about 275.9246626275.

Adding to 21007364 its reverse (46370012), we get a palindrome (67377376).

The spelling of 21007364 in words is "twenty-one million, seven thousand, three hundred sixty-four".