2131121404 has 12 divisors (see below), whose sum is σ = 3730654984. Its totient is φ = 1065219984.

The previous prime is 2131121393. The next prime is 2131121407. The reversal of 2131121404 is 4041211312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131121407) 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, 70839 + ... + 96334.

Almost surely, 2^2131121404 is an apocalyptic number.

It is an amenable number.

2131121404 is a deficient number, since it is larger than the sum of its proper divisors (1599533580).

2131121404 is a wasteful number, since it uses less digits than its factorization.

2131121404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170364 (or 170362 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 2131121404 is about 46164.0704877722. The cubic root of 2131121404 is about 1286.8741101393.

Adding to 2131121404 its reverse (4041211312), we get a palindrome (6172332716).

The spelling of 2131121404 in words is "two billion, one hundred thirty-one million, one hundred twenty-one thousand, four hundred four".