22013212021 has 4 divisors (see below), whose sum is σ = 22124954412. Its totient is φ = 21901469632.

The previous prime is 22013211989. The next prime is 22013212043. The reversal of 22013212021 is 12021231022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18160527121 + 3852684900 = 134761^2 + 62070^2 .

It is a cyclic number.

It is not a de Polignac number, because 22013212021 - 2⁵ = 22013211989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22013211986 and 22013212004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22013212061) 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 3 ways as a sum of consecutive naturals, for example, 55870900 + ... + 55871293.

It is an arithmetic number, because the mean of its divisors is an integer number (5531238603).

Almost surely, 2^22013212021 is an apocalyptic number.

It is an amenable number.

22013212021 is a deficient number, since it is larger than the sum of its proper divisors (111742391).

22013212021 is a wasteful number, since it uses less digits than its factorization.

22013212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111742390.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 22013212021 its reverse (12021231022), we get a palindrome (34034443043).

The spelling of 22013212021 in words is "twenty-two billion, thirteen million, two hundred twelve thousand, twenty-one".