21103130231 has 4 divisors (see below), whose sum is σ = 21418102392. Its totient is φ = 20788158072.

The previous prime is 21103130219. The next prime is 21103130261. The reversal of 21103130231 is 13203130112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21103130231 - 2²⁶ = 21036021367 is a prime.

It is a super-2 number, since 2×21103130231² (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 (21103130201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 157485980 + ... + 157486113.

It is an arithmetic number, because the mean of its divisors is an integer number (5354525598).

Almost surely, 2^21103130231 is an apocalyptic number.

21103130231 is a deficient number, since it is larger than the sum of its proper divisors (314972161).

21103130231 is an equidigital number, since it uses as much as digits as its factorization.

21103130231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314972160.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21103130231 its reverse (13203130112), we get a palindrome (34306260343).

The spelling of 21103130231 in words is "twenty-one billion, one hundred three million, one hundred thirty thousand, two hundred thirty-one".