21323431204442 has 8 divisors (see below), whose sum is σ = 32020256740032. Its totient is φ = 10650012291100.

The previous prime is 21323431204409. The next prime is 21323431204447. The reversal of 21323431204442 is 24440213432312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21323431204447) 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, 5851653284 + ... + 5851656927.

It is an arithmetic number, because the mean of its divisors is an integer number (4002532092504).

Almost surely, 2^{21323431204442} is an apocalyptic number.

21323431204442 is a deficient number, since it is larger than the sum of its proper divisors (10696825535590).

21323431204442 is a wasteful number, since it uses less digits than its factorization.

21323431204442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11703311124.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 21323431204442 its reverse (24440213432312), we get a palindrome (45763644636754).

The spelling of 21323431204442 in words is "twenty-one trillion, three hundred twenty-three billion, four hundred thirty-one million, two hundred four thousand, four hundred forty-two".