21012022313 has 4 divisors (see below), whose sum is σ = 21021285060. Its totient is φ = 21002759568.

The previous prime is 21012022307. The next prime is 21012022333. The reversal of 21012022313 is 31322021012.

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 7633167424 + 13378854889 = 87368^2 + 115667^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012022313 - 2¹² = 21012018217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21012022291 and 21012022300.

It is not an unprimeable number, because it can be changed into a prime (21012022333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4627970 + ... + 4632507.

It is an arithmetic number, because the mean of its divisors is an integer number (5255321265).

Almost surely, 2^21012022313 is an apocalyptic number.

It is an amenable number.

21012022313 is a deficient number, since it is larger than the sum of its proper divisors (9262747).

21012022313 is an equidigital number, since it uses as much as digits as its factorization.

21012022313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9262746.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21012022313 its reverse (31322021012), we get a palindrome (52334043325).

The spelling of 21012022313 in words is "twenty-one billion, twelve million, twenty-two thousand, three hundred thirteen".