21031120032122 has 4 divisors (see below), whose sum is σ = 31546680048186. Its totient is φ = 10515560016060.

The previous prime is 21031120032119. The next prime is 21031120032157. The reversal of 21031120032122 is 22123002113012.

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

It can be written as a sum of positive squares in only one way, i.e., 20507756045401 + 523363986721 = 4528549^2 + 723439^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21031120032094 and 21031120032103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5257780008029 + ... + 5257780008032.

Almost surely, 2^{21031120032122} is an apocalyptic number.

21031120032122 is a deficient number, since it is larger than the sum of its proper divisors (10515560016064).

21031120032122 is a wasteful number, since it uses less digits than its factorization.

21031120032122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10515560016063.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21031120032122 its reverse (22123002113012), we get a palindrome (43154122145134).

The spelling of 21031120032122 in words is "twenty-one trillion, thirty-one billion, one hundred twenty million, thirty-two thousand, one hundred twenty-two".