21372934 has 16 divisors (see below), whose sum is σ = 36495360. Its totient is φ = 9292360.

The previous prime is 21372889. The next prime is 21372937. The reversal of 21372934 is 43927312.

It is a junction number, because it is equal to n+sod(n) for n = 21372896 and 21372905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21372937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20614 + ... + 21625.

It is an arithmetic number, because the mean of its divisors is an integer number (2280960).

Almost surely, 2^21372934 is an apocalyptic number.

21372934 is a deficient number, since it is larger than the sum of its proper divisors (15122426).

21372934 is a wasteful number, since it uses less digits than its factorization.

21372934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42275.

The product of its digits is 9072, while the sum is 31.

The square root of 21372934 is about 4623.0870638568. The cubic root of 21372934 is about 277.5160134687.

The spelling of 21372934 in words is "twenty-one million, three hundred seventy-two thousand, nine hundred thirty-four".