210122220121 has 32 divisors (see below), whose sum is σ = 236390317056. Its totient is φ = 185166720000.

The previous prime is 210122220101. The next prime is 210122220127. The reversal of 210122220121 is 121022221012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 210122220121 - 2²³ = 210113831513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210122220095 and 210122220104.

It is not an unprimeable number, because it can be changed into a prime (210122220127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11101656 + ... + 11120566.

It is an arithmetic number, because the mean of its divisors is an integer number (7387197408).

Almost surely, 2^210122220121 is an apocalyptic number.

It is an amenable number.

210122220121 is a deficient number, since it is larger than the sum of its proper divisors (26268096935).

210122220121 is a wasteful number, since it uses less digits than its factorization.

210122220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19233.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210122220121 its reverse (121022221012), we get a palindrome (331144441133).

It can be divided in two parts, 2101 and 22220121, that added together give a palindrome (22222222).

The spelling of 210122220121 in words is "two hundred ten billion, one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".