21012132313 has 4 divisors (see below), whose sum is σ = 21062042788. Its totient is φ = 20962221840.

The previous prime is 21012132283. The next prime is 21012132329. The reversal of 21012132313 is 31323121012.

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 25684624 + 20986447689 = 5068^2 + 144867^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012132313 - 2²¹ = 21010035161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012133313) 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 in 3 ways as a sum of consecutive naturals, for example, 24954606 + ... + 24955447.

It is an arithmetic number, because the mean of its divisors is an integer number (5265510697).

Almost surely, 2^21012132313 is an apocalyptic number.

It is an amenable number.

21012132313 is a deficient number, since it is larger than the sum of its proper divisors (49910475).

21012132313 is an equidigital number, since it uses as much as digits as its factorization.

21012132313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49910474.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21012132313 its reverse (31323121012), we get a palindrome (52335253325).

The spelling of 21012132313 in words is "twenty-one billion, twelve million, one hundred thirty-two thousand, three hundred thirteen".