21706684054 has 16 divisors (see below), whose sum is σ = 35524947600. Its totient is φ = 9865308160.

The previous prime is 21706684001. The next prime is 21706684061. The reversal of 21706684054 is 45048660712.

It is a self number, because there is not a number n which added to its sum of digits gives 21706684054.

It is a congruent number.

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, 103782 + ... + 232774.

It is an arithmetic number, because the mean of its divisors is an integer number (2220309225).

Almost surely, 2^21706684054 is an apocalyptic number.

21706684054 is a deficient number, since it is larger than the sum of its proper divisors (13818263546).

21706684054 is a wasteful number, since it uses less digits than its factorization.

21706684054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136655.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 21706684054 in words is "twenty-one billion, seven hundred six million, six hundred eighty-four thousand, fifty-four".