21506201631199 has 2 divisors, whose sum is σ = 21506201631200. Its totient is φ = 21506201631198.

The previous prime is 21506201631197. The next prime is 21506201631353. The reversal of 21506201631199 is 99113610260512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21506201631199 - 2¹ = 21506201631197 is a prime.

Together with 21506201631197, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21506201631191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753100815599 + 10753100815600.

It is an arithmetic number, because the mean of its divisors is an integer number (10753100815600).

Almost surely, 2^{21506201631199} is an apocalyptic number.

21506201631199 is a deficient number, since it is larger than the sum of its proper divisors (1).

21506201631199 is an equidigital number, since it uses as much as digits as its factorization.

21506201631199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 21506201631199 in words is "twenty-one trillion, five hundred six billion, two hundred one million, six hundred thirty-one thousand, one hundred ninety-nine".