21011012131313 has 4 divisors (see below), whose sum is σ = 21152025635700. Its totient is φ = 20869998626928.

The previous prime is 21011012131253. The next prime is 21011012131331. The reversal of 21011012131313 is 31313121011012.

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 12879435196849 + 8131576934464 = 3588793^2 + 2851592^2 .

It is a cyclic number.

It is not a de Polignac number, because 21011012131313 - 2²² = 21011007937009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011012131013) 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, 70506751970 + ... + 70506752267.

It is an arithmetic number, because the mean of its divisors is an integer number (5288006408925).

Almost surely, 2^{21011012131313} is an apocalyptic number.

It is an amenable number.

21011012131313 is a deficient number, since it is larger than the sum of its proper divisors (141013504387).

21011012131313 is a wasteful number, since it uses less digits than its factorization.

21011012131313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141013504386.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 21011012131313 its reverse (31313121011012), we get a palindrome (52324133142325).

The spelling of 21011012131313 in words is "twenty-one trillion, eleven billion, twelve million, one hundred thirty-one thousand, three hundred thirteen".