20101001220999 has 24 divisors (see below), whose sum is σ = 29622418056192. Its totient is φ = 13131544052880.

The previous prime is 20101001220947. The next prime is 20101001221001. The reversal of 20101001220999 is 99902210010102.

It is not a de Polignac number, because 20101001220999 - 2⁷ = 20101001220871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101001221999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87149209 + ... + 87379554.

It is an arithmetic number, because the mean of its divisors is an integer number (1234267419008).

Almost surely, 2^{20101001220999} is an apocalyptic number.

20101001220999 is a deficient number, since it is larger than the sum of its proper divisors (9521416835193).

20101001220999 is a wasteful number, since it uses less digits than its factorization.

20101001220999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174529027 (or 174529024 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 20101001220999 in words is "twenty trillion, one hundred one billion, one million, two hundred twenty thousand, nine hundred ninety-nine".