21221022239 has 2 divisors, whose sum is σ = 21221022240. Its totient is φ = 21221022238.

The previous prime is 21221022167. The next prime is 21221022287. The reversal of 21221022239 is 93222012212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21221022239 - 2²⁸ = 20952586783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21221027239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610511119 + 10610511120.

It is an arithmetic number, because the mean of its divisors is an integer number (10610511120).

Almost surely, 2^21221022239 is an apocalyptic number.

21221022239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221022239 is an equidigital number, since it uses as much as digits as its factorization.

21221022239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The spelling of 21221022239 in words is "twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred thirty-nine".