21326401110 has 64 divisors (see below), whose sum is σ = 58638528000. Its totient is φ = 4862668032.

The previous prime is 21326401099. The next prime is 21326401127. The reversal of 21326401110 is 1110462312.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 38260 + ... + 210039.

It is an arithmetic number, because the mean of its divisors is an integer number (916227000).

Almost surely, 2^21326401110 is an apocalyptic number.

21326401110 is an abundant number, since it is smaller than the sum of its proper divisors (37312126890).

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

21326401110 is a wasteful number, since it uses less digits than its factorization.

21326401110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248725.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21326401110 its reverse (1110462312), we get a palindrome (22436863422).

The spelling of 21326401110 in words is "twenty-one billion, three hundred twenty-six million, four hundred one thousand, one hundred ten".