201011102211221 has 4 divisors (see below), whose sum is σ = 212835284694252. Its totient is φ = 189186919728192.

The previous prime is 201011102211217. The next prime is 201011102211223. The reversal of 201011102211221 is 122112201110102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84282222886225 + 116728879324996 = 9180535^2 + 10804114^2 .

It is a cyclic number.

It is not a de Polignac number, because 201011102211221 - 2² = 201011102211217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 11824182483013 = 201011102211221 / (2 + 0 + 1 + 0 + 1 + 1 + 1 + 0 + 2 + 2 + 1 + 1 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 201011102211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011102211223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5912091241490 + ... + 5912091241523.

It is an arithmetic number, because the mean of its divisors is an integer number (53208821173563).

Almost surely, 2^{201011102211221} is an apocalyptic number.

It is an amenable number.

201011102211221 is a deficient number, since it is larger than the sum of its proper divisors (11824182483031).

201011102211221 is a wasteful number, since it uses less digits than its factorization.

201011102211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11824182483030.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 201011102211221 its reverse (122112201110102), we get a palindrome (323123303321323).

The spelling of 201011102211221 in words is "two hundred one trillion, eleven billion, one hundred two million, two hundred eleven thousand, two hundred twenty-one".