21404222140 has 96 divisors (see below), whose sum is σ = 52714368000. Its totient is φ = 7297174080.

The previous prime is 21404222123. The next prime is 21404222219. The reversal of 21404222140 is 4122240412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1219225 + ... + 1236655.

It is an arithmetic number, because the mean of its divisors is an integer number (549108000).

Almost surely, 2^21404222140 is an apocalyptic number.

21404222140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404222140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26357184000).

21404222140 is an abundant number, since it is smaller than the sum of its proper divisors (31310145860).

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

21404222140 is a wasteful number, since it uses less digits than its factorization.

21404222140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17640 (or 17624 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21404222140 its reverse (4122240412), we get a palindrome (25526462552).

The spelling of 21404222140 in words is "twenty-one billion, four hundred four million, two hundred twenty-two thousand, one hundred forty".