2631663021 has 16 divisors (see below), whose sum is σ = 3782419200. Its totient is φ = 1617933120.

The previous prime is 2631663017. The next prime is 2631663031. The reversal of 2631663021 is 1203661362.

It is not a de Polignac number, because 2631663021 - 2² = 2631663017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2631663021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631663031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9580 + ... + 73178.

It is an arithmetic number, because the mean of its divisors is an integer number (236401200).

Almost surely, 2^2631663021 is an apocalyptic number.

It is an amenable number.

2631663021 is a deficient number, since it is larger than the sum of its proper divisors (1150756179).

2631663021 is a wasteful number, since it uses less digits than its factorization.

2631663021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64676.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 2631663021 is about 51299.7370461097. The cubic root of 2631663021 is about 1380.6282620317.

The spelling of 2631663021 in words is "two billion, six hundred thirty-one million, six hundred sixty-three thousand, twenty-one".