20112103031021 has 4 divisors (see below), whose sum is σ = 20127681733344. Its totient is φ = 20096524328700.

The previous prime is 20112103031011. The next prime is 20112103031071. The reversal of 20112103031021 is 12013030121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20112103031021 - 2²⁶ = 20112035922157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112103031011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7789349225 + ... + 7789351806.

It is an arithmetic number, because the mean of its divisors is an integer number (5031920433336).

Almost surely, 2^{20112103031021} is an apocalyptic number.

It is an amenable number.

20112103031021 is a deficient number, since it is larger than the sum of its proper divisors (15578702323).

20112103031021 is a wasteful number, since it uses less digits than its factorization.

20112103031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15578702322.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20112103031021 its reverse (12013030121102), we get a palindrome (32125133152123).

The spelling of 20112103031021 in words is "twenty trillion, one hundred twelve billion, one hundred three million, thirty-one thousand, twenty-one".