20210122211 has 4 divisors (see below), whose sum is σ = 20220755424. Its totient is φ = 20199489000.

The previous prime is 20210122199. The next prime is 20210122313. The reversal of 20210122211 is 11222101202.

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

It is a cyclic number.

It is not a de Polignac number, because 20210122211 - 2¹⁸ = 20209860067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20210122111) 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, 5313755 + ... + 5317556.

It is an arithmetic number, because the mean of its divisors is an integer number (5055188856).

Almost surely, 2^20210122211 is an apocalyptic number.

20210122211 is a deficient number, since it is larger than the sum of its proper divisors (10633213).

20210122211 is a wasteful number, since it uses less digits than its factorization.

20210122211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10633212.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20210122211 its reverse (11222101202), we get a palindrome (31432223413).

The spelling of 20210122211 in words is "twenty billion, two hundred ten million, one hundred twenty-two thousand, two hundred eleven".