21914413 has 2 divisors, whose sum is σ = 21914414. Its totient is φ = 21914412.

The previous prime is 21914369. The next prime is 21914419. The reversal of 21914413 is 31441912.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19474569 + 2439844 = 4413^2 + 1562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21914413 is a prime.

It is equal to p_1384153 and since 21914413 and 1384153 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21914419) 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 as a sum of consecutive naturals, namely, 10957206 + 10957207.

It is an arithmetic number, because the mean of its divisors is an integer number (10957207).

Almost surely, 2^21914413 is an apocalyptic number.

It is an amenable number.

21914413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21914413 is an equidigital number, since it uses as much as digits as its factorization.

21914413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 21914413 is about 4681.2832642343. The cubic root of 21914413 is about 279.8401000296.

The spelling of 21914413 in words is "twenty-one million, nine hundred fourteen thousand, four hundred thirteen".