21025660706 has 8 divisors (see below), whose sum is σ = 31539927744. Its totient is φ = 10512351460.

The previous prime is 21025660697. The next prime is 21025660723. The reversal of 21025660706 is 60706652012.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181790 + ... + 274041.

It is an arithmetic number, because the mean of its divisors is an integer number (3942490968).

Almost surely, 2^21025660706 is an apocalyptic number.

21025660706 is a deficient number, since it is larger than the sum of its proper divisors (10514267038).

21025660706 is a wasteful number, since it uses less digits than its factorization.

21025660706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478896.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 21025660706 in words is "twenty-one billion, twenty-five million, six hundred sixty thousand, seven hundred six".