201021220999966 has 8 divisors (see below), whose sum is σ = 304919829606960. Its totient is φ = 99381277797648.

The previous prime is 201021220999961. The next prime is 201021220999967. The reversal of 201021220999966 is 669999022120102.

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

It is a self number, because there is not a number n which added to its sum of digits gives 201021220999966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201021220999961) 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, 564666350946 + ... + 564666351301.

It is an arithmetic number, because the mean of its divisors is an integer number (38114978700870).

Almost surely, 2^{201021220999966} is an apocalyptic number.

201021220999966 is a deficient number, since it is larger than the sum of its proper divisors (103898608606994).

201021220999966 is a wasteful number, since it uses less digits than its factorization.

201021220999966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129332702338.

The product of its (nonzero) digits is 3779136, while the sum is 58.

The spelling of 201021220999966 in words is "two hundred one trillion, twenty-one billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred sixty-six".