21000230031 has 8 divisors (see below), whose sum is σ = 30545789184. Its totient is φ = 12727412120.

The previous prime is 21000230011. The next prime is 21000230047. The reversal of 21000230031 is 13003200012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21000230031 - 2²⁵ = 20966675599 is a prime.

It is a super-2 number, since 2×21000230031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21000229989 and 21000230016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000230011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318185271 + ... + 318185336.

It is an arithmetic number, because the mean of its divisors is an integer number (3818223648).

Almost surely, 2^21000230031 is an apocalyptic number.

21000230031 is a deficient number, since it is larger than the sum of its proper divisors (9545559153).

21000230031 is a wasteful number, since it uses less digits than its factorization.

21000230031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636370621.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21000230031 its reverse (13003200012), we get a palindrome (34003430043).

The spelling of 21000230031 in words is "twenty-one billion, two hundred thirty thousand, thirty-one".