21442413320 has 64 divisors (see below), whose sum is σ = 51414289920. Its totient is φ = 8029483264.

The previous prime is 21442413319. The next prime is 21442413337. The reversal of 21442413320 is 2331424412.

It is a self number, because there is not a number n which added to its sum of digits gives 21442413320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204707 + ... + 291186.

It is an arithmetic number, because the mean of its divisors is an integer number (803348280).

Almost surely, 2^21442413320 is an apocalyptic number.

21442413320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21442413320 is an abundant number, since it is smaller than the sum of its proper divisors (29971876600).

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

21442413320 is a wasteful number, since it uses less digits than its factorization.

21442413320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495974 (or 495970 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21442413320 its reverse (2331424412), we get a palindrome (23773837732).

The spelling of 21442413320 in words is "twenty-one billion, four hundred forty-two million, four hundred thirteen thousand, three hundred twenty".