21113137313 has 2 divisors, whose sum is σ = 21113137314. Its totient is φ = 21113137312.

The previous prime is 21113137271. The next prime is 21113137319. The reversal of 21113137313 is 31373131112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13236042304 + 7877095009 = 115048^2 + 88753^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113137313 - 2⁶ = 21113137249 is a prime.

It is not a weakly prime, because it can be changed into another prime (21113137319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556568656 + 10556568657.

It is an arithmetic number, because the mean of its divisors is an integer number (10556568657).

Almost surely, 2^21113137313 is an apocalyptic number.

It is an amenable number.

21113137313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113137313 is an equidigital number, since it uses as much as digits as its factorization.

21113137313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134, while the sum is 26.

Adding to 21113137313 its reverse (31373131112), we get a palindrome (52486268425).

The spelling of 21113137313 in words is "twenty-one billion, one hundred thirteen million, one hundred thirty-seven thousand, three hundred thirteen".