21010605366 has 8 divisors (see below), whose sum is σ = 42021210744. Its totient is φ = 7003535120.

The previous prime is 21010605361. The next prime is 21010605373. The reversal of 21010605366 is 66350601012.

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

21010605366 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010605361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750883775 + ... + 1750883786.

It is an arithmetic number, because the mean of its divisors is an integer number (5252651343).

Almost surely, 2^21010605366 is an apocalyptic number.

21010605366 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010605366 is a wasteful number, since it uses less digits than its factorization.

21010605366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3501767566.

The product of its (nonzero) digits is 6480, while the sum is 30.

The spelling of 21010605366 in words is "twenty-one billion, ten million, six hundred five thousand, three hundred sixty-six".