210220122121 has 4 divisors (see below), whose sum is σ = 213357735952. Its totient is φ = 207082508292.

The previous prime is 210220122113. The next prime is 210220122127. The reversal of 210220122121 is 121221022012.

It is a happy number.

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 210220122121 - 2³ = 210220122113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210220122095 and 210220122104.

It is not an unprimeable number, because it can be changed into a prime (210220122127) 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, 1568806815 + ... + 1568806948.

It is an arithmetic number, because the mean of its divisors is an integer number (53339433988).

Almost surely, 2^210220122121 is an apocalyptic number.

It is an amenable number.

210220122121 is a deficient number, since it is larger than the sum of its proper divisors (3137613831).

210220122121 is an equidigital number, since it uses as much as digits as its factorization.

210220122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137613830.

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

Adding to 210220122121 its reverse (121221022012), we get a palindrome (331441144133).

The spelling of 210220122121 in words is "two hundred ten billion, two hundred twenty million, one hundred twenty-two thousand, one hundred twenty-one".