1000201221 has 12 divisors (see below), whose sum is σ = 1445091648. Its totient is φ = 666636264.

The previous prime is 1000201193. The next prime is 1000201229. The reversal of 1000201221 is 1221020001.

It is not a de Polignac number, because 1000201221 - 2⁶ = 1000201157 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 (1000201229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33246 + ... + 55728.

It is an arithmetic number, because the mean of its divisors is an integer number (120424304).

Almost surely, 2^1000201221 is an apocalyptic number.

It is an amenable number.

1000201221 is a deficient number, since it is larger than the sum of its proper divisors (444890427).

1000201221 is a wasteful number, since it uses less digits than its factorization.

1000201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27432 (or 27429 counting only the distinct ones).

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

The square root of 1000201221 is about 31625.9580250148. The cubic root of 1000201221 is about 1000.0670691683.

Adding to 1000201221 its reverse (1221020001), we get a palindrome (2221221222).

The spelling of 1000201221 in words is "one billion, two hundred one thousand, two hundred twenty-one".