20210222121 has 4 divisors (see below), whose sum is σ = 26946962832. Its totient is φ = 13473481412.

The previous prime is 20210222117. The next prime is 20210222143. The reversal of 20210222121 is 12122201202.

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 20210222121 - 2² = 20210222117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20210222121.

It is not an unprimeable number, because it can be changed into a prime (20210222111) 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, 3368370351 + ... + 3368370356.

It is an arithmetic number, because the mean of its divisors is an integer number (6736740708).

Almost surely, 2^20210222121 is an apocalyptic number.

It is an amenable number.

20210222121 is a deficient number, since it is larger than the sum of its proper divisors (6736740711).

20210222121 is an equidigital number, since it uses as much as digits as its factorization.

20210222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6736740710.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20210222121 its reverse (12122201202), we get a palindrome (32332423323).

The spelling of 20210222121 in words is "twenty billion, two hundred ten million, two hundred twenty-two thousand, one hundred twenty-one".