2121431 has 8 divisors (see below), whose sum is σ = 2328480. Its totient is φ = 1920672.

The previous prime is 2121403. The next prime is 2121433. The reversal of 2121431 is 1341212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121431 - 2⁶ = 2121367 is a prime.

It is a super-2 number, since 2×2121431² = 9000938975522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851 + ... + 2228.

It is an arithmetic number, because the mean of its divisors is an integer number (291060).

2^2121431 is an apocalyptic number.

2121431 is a deficient number, since it is larger than the sum of its proper divisors (207049).

2121431 is a wasteful number, since it uses less digits than its factorization.

2121431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145.

The product of its digits is 48, while the sum is 14.

The square root of 2121431 is about 1456.5133023766. The cubic root of 2121431 is about 128.4920634825.

Adding to 2121431 its reverse (1341212), we get a palindrome (3462643).

It can be divided in two parts, 2121 and 431, that added together give a palindrome (2552).

The spelling of 2121431 in words is "two million, one hundred twenty-one thousand, four hundred thirty-one".