21713934 has 32 divisors (see below), whose sum is σ = 47784960. Its totient is φ = 6577560.

The previous prime is 21713929. The next prime is 21713957. The reversal of 21713934 is 43931712.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 6627 + ... + 9345.

It is an arithmetic number, because the mean of its divisors is an integer number (1493280).

Almost surely, 2^21713934 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21713934, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23892480).

21713934 is an abundant number, since it is smaller than the sum of its proper divisors (26071026).

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

21713934 is a wasteful number, since it uses less digits than its factorization.

21713934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2757 (or 2735 counting only the distinct ones).

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

The square root of 21713934 is about 4659.8212412066. The cubic root of 21713934 is about 278.9841334228.

It can be divided in two parts, 2171 and 3934, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 21713934 in words is "twenty-one million, seven hundred thirteen thousand, nine hundred thirty-four".