2100122121 has 4 divisors (see below), whose sum is σ = 2800162832. Its totient is φ = 1400081412.

The previous prime is 2100122119. The next prime is 2100122137. The reversal of 2100122121 is 1212210012.

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 2100122121 - 2¹ = 2100122119 is a prime.

It is a super-2 number, since 2×2100122121² = 8821025846227077282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100122097 and 2100122106.

It is not an unprimeable number, because it can be changed into a prime (2100122221) 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, 350020351 + ... + 350020356.

It is an arithmetic number, because the mean of its divisors is an integer number (700040708).

Almost surely, 2^2100122121 is an apocalyptic number.

It is an amenable number.

2100122121 is a deficient number, since it is larger than the sum of its proper divisors (700040711).

2100122121 is an equidigital number, since it uses as much as digits as its factorization.

2100122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700040710.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 2100122121 is about 45827.0893795362. The cubic root of 2100122121 is about 1280.6039876187.

Adding to 2100122121 its reverse (1212210012), we get a palindrome (3312332133).

The spelling of 2100122121 in words is "two billion, one hundred million, one hundred twenty-two thousand, one hundred twenty-one".