2121043431 has 16 divisors (see below), whose sum is σ = 3047563904. Its totient is φ = 1304416224.

The previous prime is 2121043427. The next prime is 2121043433. The reversal of 2121043431 is 1343401212.

It is not a de Polignac number, because 2121043431 - 2² = 2121043427 is a prime.

It is a super-2 number, since 2×2121043431² = 8997650472376503522, 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 = 2121043398 and 2121043407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121043433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46740 + ... + 80166.

It is an arithmetic number, because the mean of its divisors is an integer number (190472744).

Almost surely, 2^2121043431 is an apocalyptic number.

2121043431 is a deficient number, since it is larger than the sum of its proper divisors (926520473).

2121043431 is a wasteful number, since it uses less digits than its factorization.

2121043431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35070.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 2121043431 is about 46054.7872755917. The cubic root of 2121043431 is about 1284.8423817130.

Adding to 2121043431 its reverse (1343401212), we get a palindrome (3464444643).

The spelling of 2121043431 in words is "two billion, one hundred twenty-one million, forty-three thousand, four hundred thirty-one".