20021200199965 has 8 divisors (see below), whose sum is σ = 24200808417720. Its totient is φ = 15900048041472.

The previous prime is 20021200199921. The next prime is 20021200200007. The reversal of 20021200199965 is 56999100212002.

It can be written as a sum of positive squares in 4 ways, for example, as 2278520813529 + 17742679386436 = 1509477^2 + 4212206^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20021200199965 - 2²¹ = 20021198102813 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14614014060 + ... + 14614015429.

It is an arithmetic number, because the mean of its divisors is an integer number (3025101052215).

Almost surely, 2^{20021200199965} is an apocalyptic number.

It is an amenable number.

20021200199965 is a deficient number, since it is larger than the sum of its proper divisors (4179608217755).

20021200199965 is a wasteful number, since it uses less digits than its factorization.

20021200199965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29228029631.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 20021200199965 in words is "twenty trillion, twenty-one billion, two hundred million, one hundred ninety-nine thousand, nine hundred sixty-five".