2131121104 has 20 divisors (see below), whose sum is σ = 4718911264. Its totient is φ = 913337568.

The previous prime is 2131121093. The next prime is 2131121107. The reversal of 2131121104 is 4011211312.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131121107) 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, 9513822 + ... + 9514045.

Almost surely, 2^2131121104 is an apocalyptic number.

It is an amenable number.

2131121104 is an abundant number, since it is smaller than the sum of its proper divisors (2587790160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2131121104 is a wasteful number, since it uses less digits than its factorization.

2131121104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19027882 (or 19027876 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 2131121104 is about 46164.0672384919. The cubic root of 2131121104 is about 1286.8740497544.

Adding to 2131121104 its reverse (4011211312), we get a palindrome (6142332416).

The spelling of 2131121104 in words is "two billion, one hundred thirty-one million, one hundred twenty-one thousand, one hundred four".