21202344042 has 32 divisors (see below), whose sum is σ = 47751911424. Its totient is φ = 6217695600.

The previous prime is 21202344029. The next prime is 21202344043. The reversal of 21202344042 is 24044320212.

It is not an unprimeable number, because it can be changed into a prime (21202344043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5179368 + ... + 5183459.

It is an arithmetic number, because the mean of its divisors is an integer number (1492247232).

Almost surely, 2^21202344042 is an apocalyptic number.

21202344042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21202344042 is an abundant number, since it is smaller than the sum of its proper divisors (26549567382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202344042 is a wasteful number, since it uses less digits than its factorization.

21202344042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10362874.

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21202344042 its reverse (24044320212), we get a palindrome (45246664254).

The spelling of 21202344042 in words is "twenty-one billion, two hundred two million, three hundred forty-four thousand, forty-two".