1000200001221 has 12 divisors (see below), whose sum is σ = 1479970734060. Its totient is φ = 650536585920.

The previous prime is 1000200001217. The next prime is 1000200001237. The reversal of 1000200001221 is 1221000020001.

It can be written as a sum of positive squares in 2 ways, for example, as 90971004996 + 909228996225 = 301614^2 + 953535^2 .

It is not a de Polignac number, because 1000200001221 - 2² = 1000200001217 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 (1000200000221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1355284186 + ... + 1355284923.

It is an arithmetic number, because the mean of its divisors is an integer number (123330894505).

Almost surely, 2^{1000200001221} is an apocalyptic number.

It is an amenable number.

1000200001221 is a deficient number, since it is larger than the sum of its proper divisors (479770732839).

1000200001221 is a wasteful number, since it uses less digits than its factorization.

1000200001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2710569156 (or 2710569153 counting only the distinct ones).

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

Adding to 1000200001221 its reverse (1221000020001), we get a palindrome (2221200021222).

The spelling of 1000200001221 in words is "one trillion, two hundred million, one thousand, two hundred twenty-one".