21431101110 has 32 divisors (see below), whose sum is σ = 54141730560. Its totient is φ = 5414172768.

The previous prime is 21431101073. The next prime is 21431101117. The reversal of 21431101110 is 1110113412.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21431101110.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21431101117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18798642 + ... + 18799781.

It is an arithmetic number, because the mean of its divisors is an integer number (1691929080).

Almost surely, 2^21431101110 is an apocalyptic number.

21431101110 is an abundant number, since it is smaller than the sum of its proper divisors (32710629450).

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

21431101110 is a wasteful number, since it uses less digits than its factorization.

21431101110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37598452.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21431101110 its reverse (1110113412), we get a palindrome (22541214522).

The spelling of 21431101110 in words is "twenty-one billion, four hundred thirty-one million, one hundred one thousand, one hundred ten".