21328942 has 8 divisors (see below), whose sum is σ = 32323536. Its totient is φ = 10554432.

The previous prime is 21328927. The next prime is 21328943. The reversal of 21328942 is 24982312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21328943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54778 + ... + 55165.

It is an arithmetic number, because the mean of its divisors is an integer number (4040442).

Almost surely, 2^21328942 is an apocalyptic number.

21328942 is a deficient number, since it is larger than the sum of its proper divisors (10994594).

21328942 is a wasteful number, since it uses less digits than its factorization.

21328942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110042.

The product of its digits is 6912, while the sum is 31.

The square root of 21328942 is about 4618.3267532733. The cubic root of 21328942 is about 277.3254785564.

The spelling of 21328942 in words is "twenty-one million, three hundred twenty-eight thousand, nine hundred forty-two".