21932742 has 16 divisors (see below), whose sum is σ = 47239920. Its totient is φ = 6748512.

The previous prime is 21932711. The next prime is 21932747. The reversal of 21932742 is 24723912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21932747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140517 + ... + 140672.

It is an arithmetic number, because the mean of its divisors is an integer number (2952495).

Almost surely, 2^21932742 is an apocalyptic number.

21932742 is an abundant number, since it is smaller than the sum of its proper divisors (25307178).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21932742 is a wasteful number, since it uses less digits than its factorization.

21932742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281207.

The product of its digits is 6048, while the sum is 30.

The square root of 21932742 is about 4683.2405447510. The cubic root of 21932742 is about 279.9180967930.

The spelling of 21932742 in words is "twenty-one million, nine hundred thirty-two thousand, seven hundred forty-two".