21105088607 has 16 divisors (see below), whose sum is σ = 21636657792. Its totient is φ = 20578889760.

The previous prime is 21105088597. The next prime is 21105088639. The reversal of 21105088607 is 70688050112.

It is a cyclic number.

It is not a de Polignac number, because 21105088607 - 2⁴ = 21105088591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105088007) 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, 6085688 + ... + 6089154.

It is an arithmetic number, because the mean of its divisors is an integer number (1352291112).

Almost surely, 2^21105088607 is an apocalyptic number.

21105088607 is a deficient number, since it is larger than the sum of its proper divisors (531569185).

21105088607 is a wasteful number, since it uses less digits than its factorization.

21105088607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4198.

The product of its (nonzero) digits is 26880, while the sum is 38.

The spelling of 21105088607 in words is "twenty-one billion, one hundred five million, eighty-eight thousand, six hundred seven".