12122131021 has 36 divisors (see below), whose sum is σ = 16692118716. Its totient is φ = 8719159680.

The previous prime is 12122131019. The next prime is 12122131057. The reversal of 12122131021 is 12013122121.

It can be written as a sum of positive squares in 2 ways, for example, as 2559246921 + 9562884100 = 50589^2 + 97790^2 .

It is not a de Polignac number, because 12122131021 - 2¹ = 12122131019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12122130986 and 12122131004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122131001) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1560 + ... + 155713.

Almost surely, 2^12122131021 is an apocalyptic number.

12122131021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12122131021 is a deficient number, since it is larger than the sum of its proper divisors (4569987695).

12122131021 is a wasteful number, since it uses less digits than its factorization.

12122131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157322 (or 157304 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12122131021 its reverse (12013122121), we get a palindrome (24135253142).

The spelling of 12122131021 in words is "twelve billion, one hundred twenty-two million, one hundred thirty-one thousand, twenty-one".