2100100121 has 4 divisors (see below), whose sum is σ = 2400114432. Its totient is φ = 1800085812.

The previous prime is 2100100109. The next prime is 2100100127. The reversal of 2100100121 is 1210010012.

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 de Polignac number, because none of the positive numbers 2^k-2100100121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2100100099 and 2100100108.

It is not an unprimeable number, because it can be changed into a prime (2100100127) 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, 150007145 + ... + 150007158.

It is an arithmetic number, because the mean of its divisors is an integer number (600028608).

Almost surely, 2^2100100121 is an apocalyptic number.

It is an amenable number.

2100100121 is a deficient number, since it is larger than the sum of its proper divisors (300014311).

2100100121 is an equidigital number, since it uses as much as digits as its factorization.

2100100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300014310.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2100100121 is about 45826.8493462075. The cubic root of 2100100121 is about 1280.5995159127.

Adding to 2100100121 its reverse (1210010012), we get a palindrome (3310110133).

The spelling of 2100100121 in words is "two billion, one hundred million, one hundred thousand, one hundred twenty-one".