2100021431 has 4 divisors (see below), whose sum is σ = 2100127200. Its totient is φ = 2099915664.

The previous prime is 2100021419. The next prime is 2100021439. The reversal of 2100021431 is 1341200012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2100021431 - 2⁶ = 2100021367 is a prime.

It is a super-2 number, since 2×2100021431² = 8820180021318575522, 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 (2100021439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13151 + ... + 66128.

It is an arithmetic number, because the mean of its divisors is an integer number (525031800).

Almost surely, 2^2100021431 is an apocalyptic number.

2100021431 is a deficient number, since it is larger than the sum of its proper divisors (105769).

2100021431 is an equidigital number, since it uses as much as digits as its factorization.

2100021431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105768.

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

The square root of 2100021431 is about 45825.9907803421. The cubic root of 2100021431 is about 1280.5835211778.

Adding to 2100021431 its reverse (1341200012), we get a palindrome (3441221443).

The spelling of 2100021431 in words is "two billion, one hundred million, twenty-one thousand, four hundred thirty-one".