21033012213 has 6 divisors (see below), whose sum is σ = 30381017654. Its totient is φ = 14022008136.

The previous prime is 21033012191. The next prime is 21033012241. The reversal of 21033012213 is 31221033012.

21033012213 is a `hidden beast` number, since 210 + 330 + 122 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15474862404 + 5558149809 = 124398^2 + 74553^2 .

It is not a de Polignac number, because 21033012213 - 2⁵ = 21033012181 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 (21033012113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1168500670 + ... + 1168500687.

Almost surely, 2^21033012213 is an apocalyptic number.

It is an amenable number.

21033012213 is a deficient number, since it is larger than the sum of its proper divisors (9348005441).

21033012213 is a wasteful number, since it uses less digits than its factorization.

21033012213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337001363 (or 2337001360 counting only the distinct ones).

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

Adding to 21033012213 its reverse (31221033012), we get a palindrome (52254045225).

The spelling of 21033012213 in words is "twenty-one billion, thirty-three million, twelve thousand, two hundred thirteen".