3731022112021 has 4 divisors (see below), whose sum is σ = 3731658702444. Its totient is φ = 3730385521600.

The previous prime is 3731022112009. The next prime is 3731022112039. The reversal of 3731022112021 is 1202112201373.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1350450843921 + 2380571268100 = 1162089^2 + 1542910^2 .

It is a cyclic number.

It is not a de Polignac number, because 3731022112021 - 2⁵ = 3731022111989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3731022112001) 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, 318286420 + ... + 318298141.

It is an arithmetic number, because the mean of its divisors is an integer number (932914675611).

Almost surely, 2^{3731022112021} is an apocalyptic number.

It is an amenable number.

3731022112021 is a deficient number, since it is larger than the sum of its proper divisors (636590423).

3731022112021 is an equidigital number, since it uses as much as digits as its factorization.

3731022112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636590422.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 3731022112021 its reverse (1202112201373), we get a palindrome (4933134313394).

The spelling of 3731022112021 in words is "three trillion, seven hundred thirty-one billion, twenty-two million, one hundred twelve thousand, twenty-one".