21371934 has 16 divisors (see below), whose sum is σ = 43653888. Its totient is φ = 6972312.

The previous prime is 21371929. The next prime is 21371963. The reversal of 21371934 is 43917312.

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 7 ways as a sum of consecutive naturals, for example, 37612 + ... + 38175.

It is an arithmetic number, because the mean of its divisors is an integer number (2728368).

Almost surely, 2^21371934 is an apocalyptic number.

21371934 is an abundant number, since it is smaller than the sum of its proper divisors (22281954).

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

21371934 is a wasteful number, since it uses less digits than its factorization.

21371934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75839.

The product of its digits is 4536, while the sum is 30.

The square root of 21371934 is about 4622.9789097507. The cubic root of 21371934 is about 277.5116852477.

The spelling of 21371934 in words is "twenty-one million, three hundred seventy-one thousand, nine hundred thirty-four".