21234340331 has 8 divisors (see below), whose sum is σ = 22655050704. Its totient is φ = 19832700160.

The previous prime is 21234340319. The next prime is 21234340363. The reversal of 21234340331 is 13304343212.

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 21234340331 - 2¹⁰ = 21234339307 is a prime.

It is a super-2 number, since 2×21234340331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21234340331.

It is not an unprimeable number, because it can be changed into a prime (21234340931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4765250 + ... + 4769703.

It is an arithmetic number, because the mean of its divisors is an integer number (2831881338).

Almost surely, 2^21234340331 is an apocalyptic number.

21234340331 is a deficient number, since it is larger than the sum of its proper divisors (1420710373).

21234340331 is a wasteful number, since it uses less digits than its factorization.

21234340331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9535101.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21234340331 its reverse (13304343212), we get a palindrome (34538683543).

The spelling of 21234340331 in words is "twenty-one billion, two hundred thirty-four million, three hundred forty thousand, three hundred thirty-one".