200000100001221 has 48 divisors (see below), whose sum is σ = 315389354159152. Its totient is φ = 121384728576000.

The previous prime is 200000100001153. The next prime is 200000100001231. The reversal of 200000100001221 is 122100001000002.

It can be written as a sum of positive squares in 8 ways, for example, as 5113753572321 + 194886346428900 = 2261361^2 + 13960170^2 .

It is not a de Polignac number, because 200000100001221 - 2⁹ = 200000100000709 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200000100001231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 167500521 + ... + 168690321.

Almost surely, 2^{200000100001221} is an apocalyptic number.

It is an amenable number.

200000100001221 is a deficient number, since it is larger than the sum of its proper divisors (115389254157931).

200000100001221 is a wasteful number, since it uses less digits than its factorization.

200000100001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1209574 (or 1209571 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 200000100001221 its reverse (122100001000002), we get a palindrome (322100101001223).

The spelling of 200000100001221 in words is "two hundred trillion, one hundred million, one thousand, two hundred twenty-one".