21110131231 has 8 divisors (see below), whose sum is σ = 24128739360. Its totient is φ = 18092241888.

The previous prime is 21110131223. The next prime is 21110131247. The reversal of 21110131231 is 13213101112.

It is a happy number.

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

It is not a de Polignac number, because 21110131231 - 2³ = 21110131223 is a prime.

It is a super-2 number, since 2×21110131231² (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 (21110132231) 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, 115216 + ... + 235573.

It is an arithmetic number, because the mean of its divisors is an integer number (3016092420).

Almost surely, 2^21110131231 is an apocalyptic number.

21110131231 is a deficient number, since it is larger than the sum of its proper divisors (3018608129).

21110131231 is an equidigital number, since it uses as much as digits as its factorization.

21110131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359393.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21110131231 its reverse (13213101112), we get a palindrome (34323232343).

The spelling of 21110131231 in words is "twenty-one billion, one hundred ten million, one hundred thirty-one thousand, two hundred thirty-one".