3129033621 has 20 divisors (see below), whose sum is σ = 4867107232. Its totient is φ = 1788015096.

The previous prime is 3129033599. The next prime is 3129033623. The reversal of 3129033621 is 1263309213.

It is not a de Polignac number, because 3129033621 - 2⁹ = 3129033109 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 (3129033623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 210001 + ... + 224406.

Almost surely, 2^3129033621 is an apocalyptic number.

It is an amenable number.

3129033621 is a deficient number, since it is larger than the sum of its proper divisors (1738073611).

3129033621 is an frugal number, since it uses more digits than its factorization.

3129033621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434438 (or 434417 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 3129033621 is about 55937.7656060733. The cubic root of 3129033621 is about 1462.6376322223.

The spelling of 3129033621 in words is "three billion, one hundred twenty-nine million, thirty-three thousand, six hundred twenty-one".