21214942 has 24 divisors (see below), whose sum is σ = 37551600. Its totient is φ = 8961120.

The previous prime is 21214937. The next prime is 21214951. The reversal of 21214942 is 24941212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5434 + ... + 8482.

It is an arithmetic number, because the mean of its divisors is an integer number (1564650).

Almost surely, 2^21214942 is an apocalyptic number.

21214942 is a deficient number, since it is larger than the sum of its proper divisors (16336658).

21214942 is a wasteful number, since it uses less digits than its factorization.

21214942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136 (or 3129 counting only the distinct ones).

The product of its digits is 1152, while the sum is 25.

The square root of 21214942 is about 4605.9680849958. The cubic root of 21214942 is about 276.8305079447.

The spelling of 21214942 in words is "twenty-one million, two hundred fourteen thousand, nine hundred forty-two".