21131210299 has 2 divisors, whose sum is σ = 21131210300. Its totient is φ = 21131210298.

The previous prime is 21131210291. The next prime is 21131210311. The reversal of 21131210299 is 99201213112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131210299 - 2³ = 21131210291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21131210299.

It is not a weakly prime, because it can be changed into another prime (21131210291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565605149 + 10565605150.

It is an arithmetic number, because the mean of its divisors is an integer number (10565605150).

Almost surely, 2^21131210299 is an apocalyptic number.

21131210299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131210299 is an equidigital number, since it uses as much as digits as its factorization.

21131210299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

The spelling of 21131210299 in words is "twenty-one billion, one hundred thirty-one million, two hundred ten thousand, two hundred ninety-nine".