21112202022121 has 4 divisors (see below), whose sum is σ = 24128230882432. Its totient is φ = 18096173161812.

The previous prime is 21112202022059. The next prime is 21112202022203. The reversal of 21112202022121 is 12122020221112.

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 a de Polignac number, because none of the positive numbers 2^k-21112202022121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112202422121) 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, 1508014430145 + ... + 1508014430158.

It is an arithmetic number, because the mean of its divisors is an integer number (6032057720608).

Almost surely, 2^{21112202022121} is an apocalyptic number.

It is an amenable number.

21112202022121 is a deficient number, since it is larger than the sum of its proper divisors (3016028860311).

21112202022121 is an equidigital number, since it uses as much as digits as its factorization.

21112202022121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016028860310.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21112202022121 its reverse (12122020221112), we get a palindrome (33234222243233).

The spelling of 21112202022121 in words is "twenty-one trillion, one hundred twelve billion, two hundred two million, twenty-two thousand, one hundred twenty-one".