21234402331 has 8 divisors (see below), whose sum is σ = 21443804928. Its totient is φ = 21025905000.

The previous prime is 21234402281. The next prime is 21234402349. The reversal of 21234402331 is 13320443212.

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 21234402331 - 2²⁷ = 21100184603 is a prime.

It is a super-2 number, since 2×21234402331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21234402296 and 21234402305.

It is not an unprimeable number, because it can be changed into a prime (21234402361) 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 7 ways as a sum of consecutive naturals, for example, 179125 + ... + 273046.

It is an arithmetic number, because the mean of its divisors is an integer number (2680475616).

Almost surely, 2^21234402331 is an apocalyptic number.

21234402331 is a deficient number, since it is larger than the sum of its proper divisors (209402597).

21234402331 is a wasteful number, since it uses less digits than its factorization.

21234402331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452633.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21234402331 its reverse (13320443212), we get a palindrome (34554845543).

The spelling of 21234402331 in words is "twenty-one billion, two hundred thirty-four million, four hundred two thousand, three hundred thirty-one".