22102012021 has 4 divisors (see below), whose sum is σ = 22216530412. Its totient is φ = 21987493632.

The previous prime is 22102011887. The next prime is 22102012027. The reversal of 22102012021 is 12021020122.

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 11852676900 + 10249335121 = 108870^2 + 101239^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102012021 - 2⁹ = 22102011509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102011992 and 22102012010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102012027) 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, 57258906 + ... + 57259291.

It is an arithmetic number, because the mean of its divisors is an integer number (5554132603).

Almost surely, 2^22102012021 is an apocalyptic number.

It is an amenable number.

22102012021 is a deficient number, since it is larger than the sum of its proper divisors (114518391).

22102012021 is a wasteful number, since it uses less digits than its factorization.

22102012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114518390.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22102012021 its reverse (12021020122), we get a palindrome (34123032143).

The spelling of 22102012021 in words is "twenty-two billion, one hundred two million, twelve thousand, twenty-one".