21211022313 has 20 divisors (see below), whose sum is σ = 34122956868. Its totient is φ = 13052936160.

The previous prime is 21211022311. The next prime is 21211022317. The reversal of 21211022313 is 31322011212.

It can be written as a sum of positive squares in 2 ways, for example, as 7673234409 + 13537787904 = 87597^2 + 116352^2 .

It is not a de Polignac number, because 21211022313 - 2¹ = 21211022311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211022311) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10070658 + ... + 10072763.

Almost surely, 2^21211022313 is an apocalyptic number.

It is an amenable number.

21211022313 is a deficient number, since it is larger than the sum of its proper divisors (12911934555).

21211022313 is a wasteful number, since it uses less digits than its factorization.

21211022313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20143446 (or 20143437 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21211022313 its reverse (31322011212), we get a palindrome (52533033525).

The spelling of 21211022313 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, three hundred thirteen".