21934413 has 12 divisors (see below), whose sum is σ = 31737888. Its totient is φ = 14597640.

The previous prime is 21934399. The next prime is 21934427. The reversal of 21934413 is 31443912.

21934413 is a `hidden beast` number, since 219 + 3 + 441 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21934399) and next prime (21934427).

It is not a de Polignac number, because 21934413 - 2⁶ = 21934349 is a prime.

It is a super-2 number, since 2×21934413² = 962236947309138, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21934483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4456 + ... + 7982.

It is an arithmetic number, because the mean of its divisors is an integer number (2644824).

Almost surely, 2^21934413 is an apocalyptic number.

It is an amenable number.

21934413 is a deficient number, since it is larger than the sum of its proper divisors (9803475).

21934413 is a wasteful number, since it uses less digits than its factorization.

21934413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4224 (or 4221 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 21934413 is about 4683.4189434643. The cubic root of 21934413 is about 279.9252053625.

The spelling of 21934413 in words is "twenty-one million, nine hundred thirty-four thousand, four hundred thirteen".