21033312013 has 16 divisors (see below), whose sum is σ = 24606590976. Its totient is φ = 17602487280.

The previous prime is 21033312011. The next prime is 21033312023. The reversal of 21033312013 is 31021333012.

It is not a de Polignac number, because 21033312013 - 2¹ = 21033312011 is a prime.

It is a super-2 number, since 2×21033312013² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033312011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861768 + ... + 885838.

It is an arithmetic number, because the mean of its divisors is an integer number (1537911936).

Almost surely, 2^21033312013 is an apocalyptic number.

It is an amenable number.

21033312013 is a deficient number, since it is larger than the sum of its proper divisors (3573278963).

21033312013 is a wasteful number, since it uses less digits than its factorization.

21033312013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27024.

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

Adding to 21033312013 its reverse (31021333012), we get a palindrome (52054645025).

The spelling of 21033312013 in words is "twenty-one billion, thirty-three million, three hundred twelve thousand, thirteen".