10200020111221 has 4 divisors (see below), whose sum is σ = 10800021294252. Its totient is φ = 9600018928192.

The previous prime is 10200020111201. The next prime is 10200020111249. The reversal of 10200020111221 is 12211102000201.

10200020111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9376670758225 + 823349352996 = 3062135^2 + 907386^2 .

It is a de Polignac number, because none of the positive numbers 2^k-10200020111221 is a prime.

It is a super-2 number, since 2×10200020111221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10200020111201) 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, 300000591490 + ... + 300000591523.

It is an arithmetic number, because the mean of its divisors is an integer number (2700005323563).

Almost surely, 2^{10200020111221} is an apocalyptic number.

It is an amenable number.

10200020111221 is a deficient number, since it is larger than the sum of its proper divisors (600001183031).

10200020111221 is an equidigital number, since it uses as much as digits as its factorization.

10200020111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600001183030.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 10200020111221 its reverse (12211102000201), we get a palindrome (22411122111422).

The spelling of 10200020111221 in words is "ten trillion, two hundred billion, twenty million, one hundred eleven thousand, two hundred twenty-one".