21312012110 has 8 divisors (see below), whose sum is σ = 38361621816. Its totient is φ = 8524804840.

The previous prime is 21312012077. The next prime is 21312012119. The reversal of 21312012110 is 1121021312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312012119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1065600596 + ... + 1065600615.

It is an arithmetic number, because the mean of its divisors is an integer number (4795202727).

Almost surely, 2^21312012110 is an apocalyptic number.

21312012110 is a deficient number, since it is larger than the sum of its proper divisors (17049609706).

21312012110 is a wasteful number, since it uses less digits than its factorization.

21312012110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131201218.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21312012110 its reverse (1121021312), we get a palindrome (22433033422).

The spelling of 21312012110 in words is "twenty-one billion, three hundred twelve million, twelve thousand, one hundred ten".