21112612305 has 8 divisors (see below), whose sum is σ = 33780179712. Its totient is φ = 11260059888.

The previous prime is 21112612229. The next prime is 21112612349. The reversal of 21112612305 is 50321621112.

It is a happy number.

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

It is not a de Polignac number, because 21112612305 - 2¹⁰ = 21112611281 is a prime.

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, 703753729 + ... + 703753758.

It is an arithmetic number, because the mean of its divisors is an integer number (4222522464).

Almost surely, 2^21112612305 is an apocalyptic number.

It is an amenable number.

21112612305 is a deficient number, since it is larger than the sum of its proper divisors (12667567407).

21112612305 is a wasteful number, since it uses less digits than its factorization.

21112612305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407507495.

The product of its (nonzero) digits is 720, while the sum is 24.

The spelling of 21112612305 in words is "twenty-one billion, one hundred twelve million, six hundred twelve thousand, three hundred five".