21449868942 has 16 divisors (see below), whose sum is σ = 42901309440. Its totient is φ = 7149694392.

The previous prime is 21449868941. The next prime is 21449868953. The reversal of 21449868942 is 24986894412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21449868941) 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 7 ways as a sum of consecutive naturals, for example, 186609 + ... + 278787.

It is an arithmetic number, because the mean of its divisors is an integer number (2681331840).

Almost surely, 2^21449868942 is an apocalyptic number.

21449868942 is an abundant number, since it is smaller than the sum of its proper divisors (21451440498).

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

21449868942 is a wasteful number, since it uses less digits than its factorization.

21449868942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130967.

The product of its digits is 7962624, while the sum is 57.

The spelling of 21449868942 in words is "twenty-one billion, four hundred forty-nine million, eight hundred sixty-eight thousand, nine hundred forty-two".