21030231213 has 12 divisors (see below), whose sum is σ = 30404065120. Its totient is φ = 14007662856.

The previous prime is 21030231197. The next prime is 21030231251. The reversal of 21030231213 is 31213203012.

It is not a de Polignac number, because 21030231213 - 2⁴ = 21030231197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030231113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1030273 + ... + 1050486.

Almost surely, 2^21030231213 is an apocalyptic number.

It is an amenable number.

21030231213 is a deficient number, since it is larger than the sum of its proper divisors (9373833907).

21030231213 is a wasteful number, since it uses less digits than its factorization.

21030231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081888 (or 2081885 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21030231213 its reverse (31213203012), we get a palindrome (52243434225).

The spelling of 21030231213 in words is "twenty-one billion, thirty million, two hundred thirty-one thousand, two hundred thirteen".