10011201221 has 12 divisors (see below), whose sum is σ = 11647475532. Its totient is φ = 8579708928.

The previous prime is 10011201209. The next prime is 10011201229. The reversal of 10011201221 is 12210211001.

It can be written as a sum of positive squares in 2 ways, for example, as 109956196 + 9901245025 = 10486^2 + 99505^2 .

It is not a de Polignac number, because 10011201221 - 2²² = 10007006917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10011201229) 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, 438341 + ... + 460613.

It is an arithmetic number, because the mean of its divisors is an integer number (970622961).

Almost surely, 2^10011201221 is an apocalyptic number.

It is an amenable number.

10011201221 is a deficient number, since it is larger than the sum of its proper divisors (1636274311).

10011201221 is an equidigital number, since it uses as much as digits as its factorization.

10011201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31460 (or 31453 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10011201221 its reverse (12210211001), we get a palindrome (22221412222).

The spelling of 10011201221 in words is "ten billion, eleven million, two hundred one thousand, two hundred twenty-one".