22031121021 has 32 divisors (see below), whose sum is σ = 37725542400. Its totient is φ = 11115555264.

The previous prime is 22031121017. The next prime is 22031121043. The reversal of 22031121021 is 12012113022.

It is not a de Polignac number, because 22031121021 - 2² = 22031121017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22031121071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1748071 + ... + 1760628.

It is an arithmetic number, because the mean of its divisors is an integer number (1178923200).

Almost surely, 2^22031121021 is an apocalyptic number.

22031121021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22031121021 is a deficient number, since it is larger than the sum of its proper divisors (15694421379).

22031121021 is a wasteful number, since it uses less digits than its factorization.

22031121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508745.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 22031121021 its reverse (12012113022), we get a palindrome (34043234043).

The spelling of 22031121021 in words is "twenty-two billion, thirty-one million, one hundred twenty-one thousand, twenty-one".