21000212239 has 2 divisors, whose sum is σ = 21000212240. Its totient is φ = 21000212238.

The previous prime is 21000212143. The next prime is 21000212243. The reversal of 21000212239 is 93221200012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000212239 - 2²¹ = 20998115087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000212339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500106119 + 10500106120.

It is an arithmetic number, because the mean of its divisors is an integer number (10500106120).

Almost surely, 2^21000212239 is an apocalyptic number.

21000212239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000212239 is an equidigital number, since it uses as much as digits as its factorization.

21000212239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 21000212239 in words is "twenty-one billion, two hundred twelve thousand, two hundred thirty-nine".