21364312 has 8 divisors (see below), whose sum is σ = 40058100. Its totient is φ = 10682152.

The previous prime is 21364307. The next prime is 21364319. The reversal of 21364312 is 21346312.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1335262 + ... + 1335277.

Almost surely, 2^21364312 is an apocalyptic number.

It is an amenable number.

21364312 is a deficient number, since it is larger than the sum of its proper divisors (18693788).

21364312 is a wasteful number, since it uses less digits than its factorization.

21364312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2670545 (or 2670541 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 21364312 is about 4622.1544759993. The cubic root of 21364312 is about 277.4786911106.

The spelling of 21364312 in words is "twenty-one million, three hundred sixty-four thousand, three hundred twelve".