21331807742699 has 2 divisors, whose sum is σ = 21331807742700. Its totient is φ = 21331807742698.

The previous prime is 21331807742659. The next prime is 21331807742747. The reversal of 21331807742699 is 99624770813312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21331807742699 - 2³² = 21327512775403 is a prime.

It is not a weakly prime, because it can be changed into another prime (21331807742629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665903871349 + 10665903871350.

It is an arithmetic number, because the mean of its divisors is an integer number (10665903871350).

Almost surely, 2^{21331807742699} is an apocalyptic number.

21331807742699 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331807742699 is an equidigital number, since it uses as much as digits as its factorization.

21331807742699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 62.

The spelling of 21331807742699 in words is "twenty-one trillion, three hundred thirty-one billion, eight hundred seven million, seven hundred forty-two thousand, six hundred ninety-nine".