20010121221199 has 16 divisors (see below), whose sum is σ = 20665599344640. Its totient is φ = 19355269500000.

The previous prime is 20010121221173. The next prime is 20010121221239. The reversal of 20010121221199 is 99112212101002.

It is a cyclic number.

It is not a de Polignac number, because 20010121221199 - 2³⁷ = 19872682267727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20010121221199.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010121221119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1093380349 + ... + 1093398649.

It is an arithmetic number, because the mean of its divisors is an integer number (1291599959040).

Almost surely, 2^{20010121221199} is an apocalyptic number.

20010121221199 is a deficient number, since it is larger than the sum of its proper divisors (655478123441).

20010121221199 is a wasteful number, since it uses less digits than its factorization.

20010121221199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33462.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 20010121221199 in words is "twenty trillion, ten billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred ninety-nine".