21012222239 has 2 divisors, whose sum is σ = 21012222240. Its totient is φ = 21012222238.

The previous prime is 21012222221. The next prime is 21012222247. The reversal of 21012222239 is 93222221012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21012222239 is a prime.

It is a super-2 number, since 2×21012222239² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21012222269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506111119 + 10506111120.

It is an arithmetic number, because the mean of its divisors is an integer number (10506111120).

Almost surely, 2^21012222239 is an apocalyptic number.

21012222239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012222239 is an equidigital number, since it uses as much as digits as its factorization.

21012222239 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 26.

The spelling of 21012222239 in words is "twenty-one billion, twelve million, two hundred twenty-two thousand, two hundred thirty-nine".