21131000233 has 8 divisors (see below), whose sum is σ = 25420752320. Its totient is φ = 17159007600.

The previous prime is 21131000213. The next prime is 21131000257. The reversal of 21131000233 is 33200013112.

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

It is not a de Polignac number, because 21131000233 - 2¹⁷ = 21130869161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21131000213) 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, 79439718 + ... + 79439983.

It is an arithmetic number, because the mean of its divisors is an integer number (3177594040).

Almost surely, 2^21131000233 is an apocalyptic number.

It is an amenable number.

21131000233 is a deficient number, since it is larger than the sum of its proper divisors (4289752087).

21131000233 is a wasteful number, since it uses less digits than its factorization.

21131000233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158879727.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21131000233 its reverse (33200013112), we get a palindrome (54331013345).

The spelling of 21131000233 in words is "twenty-one billion, one hundred thirty-one million, two hundred thirty-three", and thus it is an aban number.