21232340031 has 8 divisors (see below), whose sum is σ = 32354041984. Its totient is φ = 12132765720.

The previous prime is 21232340011. The next prime is 21232340069. The reversal of 21232340031 is 13004323212.

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

It is not a de Polignac number, because 21232340031 - 2⁷ = 21232339903 is a prime.

It is a super-2 number, since 2×21232340031² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 1011063811 = 21232340031 / (2 + 1 + 2 + 3 + 2 + 3 + 4 + 0 + 0 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232340011) 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, 505531885 + ... + 505531926.

It is an arithmetic number, because the mean of its divisors is an integer number (4044255248).

Almost surely, 2^21232340031 is an apocalyptic number.

21232340031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21232340031 is a deficient number, since it is larger than the sum of its proper divisors (11121701953).

21232340031 is a wasteful number, since it uses less digits than its factorization.

21232340031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011063821.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21232340031 its reverse (13004323212), we get a palindrome (34236663243).

The spelling of 21232340031 in words is "twenty-one billion, two hundred thirty-two million, three hundred forty thousand, thirty-one".