21054666662 has 8 divisors (see below), whose sum is σ = 31582799856. Its totient is φ = 10527066712.

The previous prime is 21054666613. The next prime is 21054666749. The reversal of 21054666662 is 26666645012.

It is a happy number.

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

It is a congruent number.

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, 12818 + ... + 205605.

It is an arithmetic number, because the mean of its divisors is an integer number (3947849982).

Almost surely, 2^21054666662 is an apocalyptic number.

21054666662 is a deficient number, since it is larger than the sum of its proper divisors (10528133194).

21054666662 is a wasteful number, since it uses less digits than its factorization.

21054666662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266622.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 21054666662 in words is "twenty-one billion, fifty-four million, six hundred sixty-six thousand, six hundred sixty-two".