21002031315 has 24 divisors (see below), whose sum is σ = 36409791600. Its totient is φ = 11199153984.

The previous prime is 21002031313. The next prime is 21002031317. The reversal of 21002031315 is 51313020012.

It is an interprime number because it is at equal distance from previous prime (21002031313) and next prime (21002031317).

It is not a de Polignac number, because 21002031315 - 2¹ = 21002031313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002031313) 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 in 23 ways as a sum of consecutive naturals, for example, 246409 + ... + 320501.

It is an arithmetic number, because the mean of its divisors is an integer number (1517074650).

Almost surely, 2^21002031315 is an apocalyptic number.

21002031315 is a deficient number, since it is larger than the sum of its proper divisors (15407760285).

21002031315 is a wasteful number, since it uses less digits than its factorization.

21002031315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80403 (or 80400 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 21002031315 its reverse (51313020012), we get a palindrome (72315051327).

The spelling of 21002031315 in words is "twenty-one billion, two million, thirty-one thousand, three hundred fifteen".