21231204402343 has 32 divisors (see below), whose sum is σ = 23153529724416. Its totient is φ = 19351375314048.

The previous prime is 21231204402329. The next prime is 21231204402389. The reversal of 21231204402343 is 34320440213212.

It is a cyclic number.

It is not a de Polignac number, because 21231204402343 - 2²⁵ = 21231170847911 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231204402323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 670436196 + ... + 670467862.

It is an arithmetic number, because the mean of its divisors is an integer number (723547803888).

Almost surely, 2^{21231204402343} is an apocalyptic number.

21231204402343 is a deficient number, since it is larger than the sum of its proper divisors (1922325322073).

21231204402343 is a wasteful number, since it uses less digits than its factorization.

21231204402343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33223.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21231204402343 its reverse (34320440213212), we get a palindrome (55551644615555).

The spelling of 21231204402343 in words is "twenty-one trillion, two hundred thirty-one billion, two hundred four million, four hundred two thousand, three hundred forty-three".