21362942 has 4 divisors (see below), whose sum is σ = 32044416. Its totient is φ = 10681470.

The previous prime is 21362941. The next prime is 21362951. The reversal of 21362942 is 24926312.

It is a semiprime because it is the product of two primes.

It is a super-4 number, since 4×21362942⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5340734 + ... + 5340737.

It is an arithmetic number, because the mean of its divisors is an integer number (8011104).

Almost surely, 2^21362942 is an apocalyptic number.

21362942 is a deficient number, since it is larger than the sum of its proper divisors (10681474).

21362942 is a wasteful number, since it uses less digits than its factorization.

21362942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10681473.

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

The square root of 21362942 is about 4622.0062743359. The cubic root of 21362942 is about 277.4727598183.

The spelling of 21362942 in words is "twenty-one million, three hundred sixty-two thousand, nine hundred forty-two".