21234942 has 24 divisors (see below), whose sum is σ = 46220616. Its totient is φ = 7045776.

The previous prime is 21234937. The next prime is 21234953. The reversal of 21234942 is 24943212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1488 + ... + 6684.

It is an arithmetic number, because the mean of its divisors is an integer number (1925859).

Almost surely, 2^21234942 is an apocalyptic number.

21234942 is an abundant number, since it is smaller than the sum of its proper divisors (24985674).

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

21234942 is a wasteful number, since it uses less digits than its factorization.

21234942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5432 (or 5429 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21234942 is about 4608.1386697885. The cubic root of 21234942 is about 276.9174729279.

The spelling of 21234942 in words is "twenty-one million, two hundred thirty-four thousand, nine hundred forty-two".