21063368 has 8 divisors (see below), whose sum is σ = 39493830. Its totient is φ = 10531680.

The previous prime is 21063311. The next prime is 21063373. The reversal of 21063368 is 86336012.

It can be written as a sum of positive squares in only one way, i.e., 20994724 + 68644 = 4582^2 + 262^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21063368.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1316453 + ... + 1316468.

Almost surely, 2^21063368 is an apocalyptic number.

It is an amenable number.

21063368 is a deficient number, since it is larger than the sum of its proper divisors (18430462).

21063368 is a wasteful number, since it uses less digits than its factorization.

21063368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632927 (or 2632923 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 21063368 is about 4589.4845026430. The cubic root of 21063368 is about 276.1696429598.

The spelling of 21063368 in words is "twenty-one million, sixty-three thousand, three hundred sixty-eight".