21103331231 has 8 divisors (see below), whose sum is σ = 21450754224. Its totient is φ = 20756862720.

The previous prime is 21103331213. The next prime is 21103331237. The reversal of 21103331231 is 13213330112.

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 21103331231 - 2¹⁴ = 21103314847 is a prime.

It is a super-2 number, since 2×21103331231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103331237) 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, 193970 + ... + 282543.

It is an arithmetic number, because the mean of its divisors is an integer number (2681344278).

Almost surely, 2^21103331231 is an apocalyptic number.

21103331231 is a deficient number, since it is larger than the sum of its proper divisors (347422993).

21103331231 is an equidigital number, since it uses as much as digits as its factorization.

21103331231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477241.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21103331231 its reverse (13213330112), we get a palindrome (34316661343).

The spelling of 21103331231 in words is "twenty-one billion, one hundred three million, three hundred thirty-one thousand, two hundred thirty-one".