20001222121999 has 4 divisors (see below), whose sum is σ = 20133680546800. Its totient is φ = 19868763697200.

The previous prime is 20001222121949. The next prime is 20001222122017. The reversal of 20001222121999 is 99912122210002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20001222121999 - 2³¹ = 19999074638351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001222121949) 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 3 ways as a sum of consecutive naturals, for example, 66229212174 + ... + 66229212475.

It is an arithmetic number, because the mean of its divisors is an integer number (5033420136700).

Almost surely, 2^{20001222121999} is an apocalyptic number.

20001222121999 is a deficient number, since it is larger than the sum of its proper divisors (132458424801).

20001222121999 is a wasteful number, since it uses less digits than its factorization.

20001222121999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132458424800.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 20001222121999 in words is "twenty trillion, one billion, two hundred twenty-two million, one hundred twenty-one thousand, nine hundred ninety-nine".