21173934 has 8 divisors (see below), whose sum is σ = 42347880. Its totient is φ = 7057976.

The previous prime is 21173927. The next prime is 21173939. The reversal of 21173934 is 43937112.

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

21173934 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21173939) 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, 1764489 + ... + 1764500.

It is an arithmetic number, because the mean of its divisors is an integer number (5293485).

Almost surely, 2^21173934 is an apocalyptic number.

21173934 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21173934 is a wasteful number, since it uses less digits than its factorization.

21173934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3528994.

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

The square root of 21173934 is about 4601.5143159616. The cubic root of 21173934 is about 276.6520238698.

The spelling of 21173934 in words is "twenty-one million, one hundred seventy-three thousand, nine hundred thirty-four".