21364042 has 16 divisors (see below), whose sum is σ = 37141632. Its totient is φ = 9026640.

The previous prime is 21364009. The next prime is 21364061. The reversal of 21364042 is 24046312.

It is a happy number.

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, 9753 + ... + 11740.

It is an arithmetic number, because the mean of its divisors is an integer number (2321352).

Almost surely, 2^21364042 is an apocalyptic number.

21364042 is a deficient number, since it is larger than the sum of its proper divisors (15777590).

21364042 is a wasteful number, since it uses less digits than its factorization.

21364042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21573.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 21364042 is about 4622.1252687481. The cubic root of 21364042 is about 277.4775221898.

The spelling of 21364042 in words is "twenty-one million, three hundred sixty-four thousand, forty-two".