20211312013 has 4 divisors (see below), whose sum is σ = 20225948668. Its totient is φ = 20196675360.

The previous prime is 20211311987. The next prime is 20211312067. The reversal of 20211312013 is 31021311202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5206776964 + 15004535049 = 72158^2 + 122493^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211312013 - 2⁹ = 20211311501 is a prime.

It is a super-2 number, since 2×20211312013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211312413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7316256 + ... + 7319017.

It is an arithmetic number, because the mean of its divisors is an integer number (5056487167).

Almost surely, 2^20211312013 is an apocalyptic number.

It is an amenable number.

20211312013 is a deficient number, since it is larger than the sum of its proper divisors (14636655).

20211312013 is a wasteful number, since it uses less digits than its factorization.

20211312013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14636654.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20211312013 its reverse (31021311202), we get a palindrome (51232623215).

The spelling of 20211312013 in words is "twenty billion, two hundred eleven million, three hundred twelve thousand, thirteen".