3139931021 has 4 divisors (see below), whose sum is σ = 3206738112. Its totient is φ = 3073123932.

The previous prime is 3139930987. The next prime is 3139931083. The reversal of 3139931021 is 1201399313.

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: 1201399313 = 103 ⋅11664071.

It is a cyclic number.

It is not a de Polignac number, because 3139931021 - 2¹⁸ = 3139668877 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 (3139939021) 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, 33403475 + ... + 33403568.

It is an arithmetic number, because the mean of its divisors is an integer number (801684528).

Almost surely, 2^3139931021 is an apocalyptic number.

It is an amenable number.

3139931021 is a deficient number, since it is larger than the sum of its proper divisors (66807091).

3139931021 is an equidigital number, since it uses as much as digits as its factorization.

3139931021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66807090.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 3139931021 is about 56035.0874095865. The cubic root of 3139931021 is about 1464.3336275999. Note that the first 3 decimals are identical.

The spelling of 3139931021 in words is "three billion, one hundred thirty-nine million, nine hundred thirty-one thousand, twenty-one".