2021103431 has 4 divisors (see below), whose sum is σ = 2059237512. Its totient is φ = 1982969352.

The previous prime is 2021103421. The next prime is 2021103443. The reversal of 2021103431 is 1343011202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021103431 is a prime.

It is a super-2 number, since 2×2021103431² = 8169718157599943522, 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 (2021103421) 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, 19066961 + ... + 19067066.

It is an arithmetic number, because the mean of its divisors is an integer number (514809378).

Almost surely, 2^2021103431 is an apocalyptic number.

2021103431 is a deficient number, since it is larger than the sum of its proper divisors (38134081).

2021103431 is an equidigital number, since it uses as much as digits as its factorization.

2021103431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38134080.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2021103431 is about 44956.6839413229. The cubic root of 2021103431 is about 1264.3369970081.

Adding to 2021103431 its reverse (1343011202), we get a palindrome (3364114633).

The spelling of 2021103431 in words is "two billion, twenty-one million, one hundred three thousand, four hundred thirty-one".