2100423121 has 4 divisors (see below), whose sum is σ = 2107134052. Its totient is φ = 2093712192.

The previous prime is 2100423119. The next prime is 2100423139. The reversal of 2100423121 is 1213240012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 514790721 + 1585632400 = 22689^2 + 39820^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100423121 - 2¹ = 2100423119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100423095 and 2100423104.

It is not an unprimeable number, because it can be changed into a prime (2100423421) 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, 3354996 + ... + 3355621.

It is an arithmetic number, because the mean of its divisors is an integer number (526783513).

Almost surely, 2^2100423121 is an apocalyptic number.

It is an amenable number.

2100423121 is a deficient number, since it is larger than the sum of its proper divisors (6710931).

2100423121 is an equidigital number, since it uses as much as digits as its factorization.

2100423121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710930.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2100423121 is about 45830.3733456318. The cubic root of 2100423121 is about 1280.6651655510.

Adding to 2100423121 its reverse (1213240012), we get a palindrome (3313663133).

The spelling of 2100423121 in words is "two billion, one hundred million, four hundred twenty-three thousand, one hundred twenty-one".