21312301110 has 16 divisors (see below), whose sum is σ = 51149522736. Its totient is φ = 5683280288.

The previous prime is 21312301037. The next prime is 21312301177. The reversal of 21312301110 is 1110321312.

It is a happy number.

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 21312301110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 355204989 + ... + 355205048.

It is an arithmetic number, because the mean of its divisors is an integer number (3196845171).

Almost surely, 2^21312301110 is an apocalyptic number.

21312301110 is an abundant number, since it is smaller than the sum of its proper divisors (29837221626).

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

21312301110 is a wasteful number, since it uses less digits than its factorization.

21312301110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710410047.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21312301110 its reverse (1110321312), we get a palindrome (22422622422).

The spelling of 21312301110 in words is "twenty-one billion, three hundred twelve million, three hundred one thousand, one hundred ten".