21232431255 has 64 divisors (see below), whose sum is σ = 40545681408. Its totient is φ = 9276769920.

The previous prime is 21232431251. The next prime is 21232431263. The reversal of 21232431255 is 55213423212.

It is not a de Polignac number, because 21232431255 - 2² = 21232431251 is a prime.

It is a super-2 number, since 2×21232431255² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232431251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3878170 + ... + 3883640.

It is an arithmetic number, because the mean of its divisors is an integer number (633526272).

Almost surely, 2^21232431255 is an apocalyptic number.

21232431255 is a deficient number, since it is larger than the sum of its proper divisors (19313250153).

21232431255 is a wasteful number, since it uses less digits than its factorization.

21232431255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7116.

The product of its digits is 14400, while the sum is 30.

Adding to 21232431255 its reverse (55213423212), we get a palindrome (76445854467).

The spelling of 21232431255 in words is "twenty-one billion, two hundred thirty-two million, four hundred thirty-one thousand, two hundred fifty-five".