20012221099999 has 4 divisors (see below), whose sum is σ = 20052006828336. Its totient is φ = 19972435371664.

The previous prime is 20012221099963. The next prime is 20012221100029. The reversal of 20012221099999 is 99999012221002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012221099999 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 (20012221096999) 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, 19892863414 + ... + 19892864419.

It is an arithmetic number, because the mean of its divisors is an integer number (5013001707084).

Almost surely, 2^{20012221099999} is an apocalyptic number.

20012221099999 is a deficient number, since it is larger than the sum of its proper divisors (39785728337).

20012221099999 is an equidigital number, since it uses as much as digits as its factorization.

20012221099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39785728336.

The product of its (nonzero) digits is 944784, while the sum is 55.

The spelling of 20012221099999 in words is "twenty trillion, twelve billion, two hundred twenty-one million, ninety-nine thousand, nine hundred ninety-nine".