2631000021 has 16 divisors (see below), whose sum is σ = 3865705536. Its totient is φ = 1581422976.

The previous prime is 2631000017. The next prime is 2631000023. The reversal of 2631000021 is 1200001362.

It is not a de Polignac number, because 2631000021 - 2² = 2631000017 is a prime.

It is a super-2 number, since 2×2631000021² = 13844322221004000882, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2631000023) 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, 782760 + ... + 786113.

It is an arithmetic number, because the mean of its divisors is an integer number (241606596).

Almost surely, 2^2631000021 is an apocalyptic number.

It is an amenable number.

2631000021 is a deficient number, since it is larger than the sum of its proper divisors (1234705515).

2631000021 is a wasteful number, since it uses less digits than its factorization.

2631000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568932.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2631000021 is about 51293.2746176338. The cubic root of 2631000021 is about 1380.5123108365.

Adding to 2631000021 its reverse (1200001362), we get a palindrome (3831001383).

The spelling of 2631000021 in words is "two billion, six hundred thirty-one million, twenty-one", and thus it is an aban number.