21403342331 has 4 divisors (see below), whose sum is σ = 24460962672. Its totient is φ = 18345721992.

The previous prime is 21403342283. The next prime is 21403342343. The reversal of 21403342331 is 13324330412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21403342331 - 2²⁶ = 21336233467 is a prime.

It is a super-2 number, since 2×21403342331² (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 21403342331.

It is not an unprimeable number, because it can be changed into a prime (21403348331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528810160 + ... + 1528810173.

It is an arithmetic number, because the mean of its divisors is an integer number (6115240668).

Almost surely, 2^21403342331 is an apocalyptic number.

21403342331 is a deficient number, since it is larger than the sum of its proper divisors (3057620341).

21403342331 is an equidigital number, since it uses as much as digits as its factorization.

21403342331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057620340.

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

Adding to 21403342331 its reverse (13324330412), we get a palindrome (34727672743).

The spelling of 21403342331 in words is "twenty-one billion, four hundred three million, three hundred forty-two thousand, three hundred thirty-one".