2021431407 has 4 divisors (see below), whose sum is σ = 2695241880. Its totient is φ = 1347620936.

The previous prime is 2021431309. The next prime is 2021431409. The reversal of 2021431407 is 7041341202.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2021431407 - 2¹² = 2021427311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021431409) 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, 336905232 + ... + 336905237.

It is an arithmetic number, because the mean of its divisors is an integer number (673810470).

Almost surely, 2^2021431407 is an apocalyptic number.

2021431407 is a deficient number, since it is larger than the sum of its proper divisors (673810473).

2021431407 is an equidigital number, since it uses as much as digits as its factorization.

2021431407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673810472.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 2021431407 is about 44960.3314823189. The cubic root of 2021431407 is about 1264.4053837049.

Adding to 2021431407 its reverse (7041341202), we get a palindrome (9062772609).

The spelling of 2021431407 in words is "two billion, twenty-one million, four hundred thirty-one thousand, four hundred seven".