21914839 has 2 divisors, whose sum is σ = 21914840. Its totient is φ = 21914838.

The previous prime is 21914833. The next prime is 21914843. The reversal of 21914839 is 93841912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21914839 - 2¹¹ = 21912791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21914798 and 21914807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21914833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10957419 + 10957420.

It is an arithmetic number, because the mean of its divisors is an integer number (10957420).

Almost surely, 2^21914839 is an apocalyptic number.

21914839 is a deficient number, since it is larger than the sum of its proper divisors (1).

21914839 is an equidigital number, since it uses as much as digits as its factorization.

21914839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 21914839 is about 4681.3287643574. The cubic root of 21914839 is about 279.8419133128.

The spelling of 21914839 in words is "twenty-one million, nine hundred fourteen thousand, eight hundred thirty-nine".