21022156867399 has 2 divisors, whose sum is σ = 21022156867400. Its totient is φ = 21022156867398.

The previous prime is 21022156867373. The next prime is 21022156867427. The reversal of 21022156867399 is 99376865122012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21022156867399 - 2¹⁷ = 21022156736327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21022156867099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511078433699 + 10511078433700.

It is an arithmetic number, because the mean of its divisors is an integer number (10511078433700).

Almost surely, 2^{21022156867399} is an apocalyptic number.

21022156867399 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022156867399 is an equidigital number, since it uses as much as digits as its factorization.

21022156867399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 21022156867399 in words is "twenty-one trillion, twenty-two billion, one hundred fifty-six million, eight hundred sixty-seven thousand, three hundred ninety-nine".