21003231313 has 8 divisors (see below), whose sum is σ = 22116885920. Its totient is φ = 19890398880.

The previous prime is 21003231203. The next prime is 21003231317. The reversal of 21003231313 is 31313230012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21003231313 - 2¹⁷ = 21003100241 is a prime.

It is a super-2 number, since 2×21003231313² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21003231317) 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 7 ways as a sum of consecutive naturals, for example, 152748 + ... + 255613.

It is an arithmetic number, because the mean of its divisors is an integer number (2764610740).

Almost surely, 2^21003231313 is an apocalyptic number.

It is an amenable number.

21003231313 is a deficient number, since it is larger than the sum of its proper divisors (1113654607).

21003231313 is a wasteful number, since it uses less digits than its factorization.

21003231313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411087.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21003231313 its reverse (31313230012), we get a palindrome (52316461325).

The spelling of 21003231313 in words is "twenty-one billion, three million, two hundred thirty-one thousand, three hundred thirteen".