20402270121 has 4 divisors (see below), whose sum is σ = 27203026832. Its totient is φ = 13601513412.

The previous prime is 20402270099. The next prime is 20402270123. The reversal of 20402270121 is 12107220402.

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 not a de Polignac number, because 20402270121 - 2¹⁴ = 20402253737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20402270123) 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, 3400378351 + ... + 3400378356.

It is an arithmetic number, because the mean of its divisors is an integer number (6800756708).

Almost surely, 2^20402270121 is an apocalyptic number.

It is an amenable number.

20402270121 is a deficient number, since it is larger than the sum of its proper divisors (6800756711).

20402270121 is an equidigital number, since it uses as much as digits as its factorization.

20402270121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800756710.

The product of its (nonzero) digits is 448, while the sum is 21.

Adding to 20402270121 its reverse (12107220402), we get a palindrome (32509490523).

The spelling of 20402270121 in words is "twenty billion, four hundred two million, two hundred seventy thousand, one hundred twenty-one".