21013412137 has 2 divisors, whose sum is σ = 21013412138. Its totient is φ = 21013412136.

The previous prime is 21013412111. The next prime is 21013412201. The reversal of 21013412137 is 73121431012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20903665561 + 109746576 = 144581^2 + 10476^2 .

It is a cyclic number.

It is not a de Polignac number, because 21013412137 - 2⁷ = 21013412009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21013412107) 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, 10506706068 + 10506706069.

It is an arithmetic number, because the mean of its divisors is an integer number (10506706069).

Almost surely, 2^21013412137 is an apocalyptic number.

It is an amenable number.

21013412137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21013412137 is an equidigital number, since it uses as much as digits as its factorization.

21013412137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 21013412137 its reverse (73121431012), we get a palindrome (94134843149).

The spelling of 21013412137 in words is "twenty-one billion, thirteen million, four hundred twelve thousand, one hundred thirty-seven".