3131140021 has 4 divisors (see below), whose sum is σ = 3131908000. Its totient is φ = 3130372044.

The previous prime is 3131140013. The next prime is 3131140043. The reversal of 3131140021 is 1200411313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1200411313 = 37 ⋅32443549.

It is a cyclic number.

It is not a de Polignac number, because 3131140021 - 2³ = 3131140013 is a prime.

It is a super-2 number, since 2×3131140021² = 19608075662215760882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3131139977 and 3131140004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131140421) 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, 377841 + ... + 386038.

It is an arithmetic number, because the mean of its divisors is an integer number (782977000).

Almost surely, 2^3131140021 is an apocalyptic number.

It is an amenable number.

3131140021 is a deficient number, since it is larger than the sum of its proper divisors (767979).

3131140021 is an equidigital number, since it uses as much as digits as its factorization.

3131140021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767978.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 3131140021 is about 55956.5905054981. The cubic root of 3131140021 is about 1462.9657642920.

Adding to 3131140021 its reverse (1200411313), we get a palindrome (4331551334).

The spelling of 3131140021 in words is "three billion, one hundred thirty-one million, one hundred forty thousand, twenty-one".