21021000313 has 2 divisors, whose sum is σ = 21021000314. Its totient is φ = 21021000312.

The previous prime is 21021000307. The next prime is 21021000337. The reversal of 21021000313 is 31300012012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13104983529 + 7916016784 = 114477^2 + 88972^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021000313 - 2²¹ = 21018903161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21021000293 and 21021000302.

It is not a weakly prime, because it can be changed into another prime (21021003313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510500156 + 10510500157.

It is an arithmetic number, because the mean of its divisors is an integer number (10510500157).

Almost surely, 2^21021000313 is an apocalyptic number.

It is an amenable number.

21021000313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021000313 is an equidigital number, since it uses as much as digits as its factorization.

21021000313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 21021000313 its reverse (31300012012), we get a palindrome (52321012325).

The spelling of 21021000313 in words is "twenty-one billion, twenty-one million, three hundred thirteen", and thus it is an aban number.