21232021213 has 16 divisors (see below), whose sum is σ = 23273353600. Its totient is φ = 19250675136.

The previous prime is 21232021171. The next prime is 21232021231. The reversal of 21232021213 is 31212023212.

It is a cyclic number.

It is not a de Polignac number, because 21232021213 - 2⁹ = 21232020701 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 (21232021313) 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, 269056 + ... + 338902.

It is an arithmetic number, because the mean of its divisors is an integer number (1454584600).

Almost surely, 2^21232021213 is an apocalyptic number.

It is an amenable number.

21232021213 is a deficient number, since it is larger than the sum of its proper divisors (2041332387).

21232021213 is a wasteful number, since it uses less digits than its factorization.

21232021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70276.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21232021213 its reverse (31212023212), we get a palindrome (52444044425).

The spelling of 21232021213 in words is "twenty-one billion, two hundred thirty-two million, twenty-one thousand, two hundred thirteen".