22012123021 has 16 divisors (see below), whose sum is σ = 26809012224. Its totient is φ = 17663217264.

The previous prime is 22012123019. The next prime is 22012123033. The reversal of 22012123021 is 12032121022.

It is a happy number.

It is not a de Polignac number, because 22012123021 - 2¹ = 22012123019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22012122986 and 22012123004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22012123121) 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, 1446915 + ... + 1462048.

It is an arithmetic number, because the mean of its divisors is an integer number (1675563264).

Almost surely, 2^22012123021 is an apocalyptic number.

It is an amenable number.

22012123021 is a deficient number, since it is larger than the sum of its proper divisors (4796889203).

22012123021 is a wasteful number, since it uses less digits than its factorization.

22012123021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909040.

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

Adding to 22012123021 its reverse (12032121022), we get a palindrome (34044244043).

The spelling of 22012123021 in words is "twenty-two billion, twelve million, one hundred twenty-three thousand, twenty-one".