20121202221999 has 16 divisors (see below), whose sum is σ = 27180352773600. Its totient is φ = 13239240094080.

The previous prime is 20121202221983. The next prime is 20121202222003. The reversal of 20121202221999 is 99912220212102.

It is not a de Polignac number, because 20121202221999 - 2⁴ = 20121202221983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20121202221999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20121202222999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143286112 + ... + 143426469.

It is an arithmetic number, because the mean of its divisors is an integer number (1698772048350).

Almost surely, 2^{20121202221999} is an apocalyptic number.

20121202221999 is a deficient number, since it is larger than the sum of its proper divisors (7059150551601).

20121202221999 is a wasteful number, since it uses less digits than its factorization.

20121202221999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286712890.

The product of its (nonzero) digits is 46656, while the sum is 42.

The spelling of 20121202221999 in words is "twenty trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty-one thousand, nine hundred ninety-nine".