21911785706 has 8 divisors (see below), whose sum is σ = 33206520900. Its totient is φ = 10842945408.

The previous prime is 21911785627. The next prime is 21911785711. The reversal of 21911785706 is 60758711912.

It can be written as a sum of positive squares in 2 ways, for example, as 19939981681 + 1971804025 = 141209^2 + 44405^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56473481 + ... + 56473868.

Almost surely, 2^21911785706 is an apocalyptic number.

21911785706 is a deficient number, since it is larger than the sum of its proper divisors (11294735194).

21911785706 is a wasteful number, since it uses less digits than its factorization.

21911785706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112947448.

The product of its (nonzero) digits is 211680, while the sum is 47.

The spelling of 21911785706 in words is "twenty-one billion, nine hundred eleven million, seven hundred eighty-five thousand, seven hundred six".