21202344400442 has 16 divisors (see below), whose sum is σ = 32111233732512. Its totient is φ = 10498664563920.

The previous prime is 21202344400427. The next prime is 21202344400481. The reversal of 21202344400442 is 24400444320212.

It is a junction number, because it is equal to n+sod(n) for n = 21202344400399 and 21202344400408.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15528608 + ... + 16838715.

It is an arithmetic number, because the mean of its divisors is an integer number (2006952108282).

Almost surely, 2^{21202344400442} is an apocalyptic number.

21202344400442 is a deficient number, since it is larger than the sum of its proper divisors (10908889332070).

21202344400442 is a wasteful number, since it uses less digits than its factorization.

21202344400442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32370493.

The product of its (nonzero) digits is 49152, while the sum is 32.

Adding to 21202344400442 its reverse (24400444320212), we get a palindrome (45602788720654).

The spelling of 21202344400442 in words is "twenty-one trillion, two hundred two billion, three hundred forty-four million, four hundred thousand, four hundred forty-two".