21350121231499 has 2 divisors, whose sum is σ = 21350121231500. Its totient is φ = 21350121231498.

The previous prime is 21350121231443. The next prime is 21350121231511. The reversal of 21350121231499 is 99413212105312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21350121231499 - 2³¹ = 21347973747851 is a prime.

It is not a weakly prime, because it can be changed into another prime (21350121241499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10675060615749 + 10675060615750.

It is an arithmetic number, because the mean of its divisors is an integer number (10675060615750).

Almost surely, 2^{21350121231499} is an apocalyptic number.

21350121231499 is a deficient number, since it is larger than the sum of its proper divisors (1).

21350121231499 is an equidigital number, since it uses as much as digits as its factorization.

21350121231499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 43.

The spelling of 21350121231499 in words is "twenty-one trillion, three hundred fifty billion, one hundred twenty-one million, two hundred thirty-one thousand, four hundred ninety-nine".