201011221221 has 16 divisors (see below), whose sum is σ = 282412838400. Its totient is φ = 126823133808.

The previous prime is 201011221217. The next prime is 201011221249. The reversal of 201011221221 is 122122110102.

It is not a de Polignac number, because 201011221221 - 2² = 201011221217 is a prime.

It is a super-2 number, since 2×201011221221² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 201011221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011221921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1768311 + ... + 1878548.

It is an arithmetic number, because the mean of its divisors is an integer number (17650802400).

Almost surely, 2^201011221221 is an apocalyptic number.

It is an amenable number.

201011221221 is a deficient number, since it is larger than the sum of its proper divisors (81401617179).

201011221221 is a wasteful number, since it uses less digits than its factorization.

201011221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3647848.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 201011221221 its reverse (122122110102), we get a palindrome (323133331323).

The spelling of 201011221221 in words is "two hundred one billion, eleven million, two hundred twenty-one thousand, two hundred twenty-one".