21105726707 has 8 divisors (see below), whose sum is σ = 22731784320. Its totient is φ = 19480032000.

The previous prime is 21105726701. The next prime is 21105726709. The reversal of 21105726707 is 70762750112.

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

It is not a de Polignac number, because 21105726707 - 2¹⁴ = 21105710323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21105726701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36707 + ... + 208707.

It is an arithmetic number, because the mean of its divisors is an integer number (2841473040).

Almost surely, 2^21105726707 is an apocalyptic number.

21105726707 is a deficient number, since it is larger than the sum of its proper divisors (1626057613).

21105726707 is a wasteful number, since it uses less digits than its factorization.

21105726707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181453.

The product of its (nonzero) digits is 41160, while the sum is 38.

The spelling of 21105726707 in words is "twenty-one billion, one hundred five million, seven hundred twenty-six thousand, seven hundred seven".