21211210122239 has 2 divisors, whose sum is σ = 21211210122240. Its totient is φ = 21211210122238.

The previous prime is 21211210122149. The next prime is 21211210122253. The reversal of 21211210122239 is 93222101211212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211210122239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211210122539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605605061119 + 10605605061120.

It is an arithmetic number, because the mean of its divisors is an integer number (10605605061120).

Almost surely, 2^{21211210122239} is an apocalyptic number.

21211210122239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211210122239 is an equidigital number, since it uses as much as digits as its factorization.

21211210122239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 21211210122239 in words is "twenty-one trillion, two hundred eleven billion, two hundred ten million, one hundred twenty-two thousand, two hundred thirty-nine".