21320444110 has 64 divisors (see below), whose sum is σ = 44442639360. Its totient is φ = 7213271040.

The previous prime is 21320444077. The next prime is 21320444191. The reversal of 21320444110 is 1144402312.

It is a happy number.

It is a super-2 number, since 2×21320444110² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1618350 + ... + 1631470.

It is an arithmetic number, because the mean of its divisors is an integer number (694416240).

Almost surely, 2^21320444110 is an apocalyptic number.

21320444110 is an abundant number, since it is smaller than the sum of its proper divisors (23122195250).

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

21320444110 is a wasteful number, since it uses less digits than its factorization.

21320444110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13441.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21320444110 its reverse (1144402312), we get a palindrome (22464846422).

The spelling of 21320444110 in words is "twenty-one billion, three hundred twenty million, four hundred forty-four thousand, one hundred ten".