21922413 has 8 divisors (see below), whose sum is σ = 29942976. Its totient is φ = 14258400.

The previous prime is 21922379. The next prime is 21922423. The reversal of 21922413 is 31422912.

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

It is not a de Polignac number, because 21922413 - 2⁶ = 21922349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88993 + ... + 89238.

It is an arithmetic number, because the mean of its divisors is an integer number (3742872).

Almost surely, 2^21922413 is an apocalyptic number.

It is an amenable number.

21922413 is a deficient number, since it is larger than the sum of its proper divisors (8020563).

21922413 is a wasteful number, since it uses less digits than its factorization.

21922413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178275.

The product of its digits is 864, while the sum is 24.

The square root of 21922413 is about 4682.1376528248. The cubic root of 21922413 is about 279.8741483739.

The spelling of 21922413 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred thirteen".