21934370 has 16 divisors (see below), whose sum is σ = 39538368. Its totient is φ = 8761200.

The previous prime is 21934357. The next prime is 21934373. The reversal of 21934370 is 7343912.

It is a super-2 number, since 2×21934370² = 962233174593800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21934373) by changing a digit.

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, 9467 + ... + 11553.

It is an arithmetic number, because the mean of its divisors is an integer number (2471148).

Almost surely, 2^21934370 is an apocalyptic number.

21934370 is a deficient number, since it is larger than the sum of its proper divisors (17603998).

21934370 is a wasteful number, since it uses less digits than its factorization.

21934370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 21934370 is about 4683.4143527986. The cubic root of 21934370 is about 279.9250224415.

The spelling of 21934370 in words is "twenty-one million, nine hundred thirty-four thousand, three hundred seventy".