20100002011221 has 24 divisors (see below), whose sum is σ = 29462122789792. Its totient is φ = 12180054189600.

The previous prime is 20100002011217. The next prime is 20100002011223. The reversal of 20100002011221 is 12211020000102.

It is not a de Polignac number, because 20100002011221 - 2² = 20100002011217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20100002011197 and 20100002011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20100002011223) 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, 1501150 + ... + 6515631.

Almost surely, 2^{20100002011221} is an apocalyptic number.

It is an amenable number.

20100002011221 is a deficient number, since it is larger than the sum of its proper divisors (9362120778571).

20100002011221 is a wasteful number, since it uses less digits than its factorization.

20100002011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8023713 (or 8023702 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20100002011221 its reverse (12211020000102), we get a palindrome (32311022011323).

The spelling of 20100002011221 in words is "twenty trillion, one hundred billion, two million, eleven thousand, two hundred twenty-one".