11101210012221 has 64 divisors (see below), whose sum is σ = 17983630963200. Its totient is φ = 5955547078656.

The previous prime is 11101210012219. The next prime is 11101210012253. The reversal of 11101210012221 is 12221001210111.

It is a happy number.

It is not a de Polignac number, because 11101210012221 - 2¹ = 11101210012219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11101210012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101210012261) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36102501 + ... + 36408693.

It is an arithmetic number, because the mean of its divisors is an integer number (280994233800).

Almost surely, 2^{11101210012221} is an apocalyptic number.

It is an amenable number.

11101210012221 is a deficient number, since it is larger than the sum of its proper divisors (6882420950979).

11101210012221 is a wasteful number, since it uses less digits than its factorization.

11101210012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307878.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11101210012221 its reverse (12221001210111), we get a palindrome (23322211222332).

The spelling of 11101210012221 in words is "eleven trillion, one hundred one billion, two hundred ten million, twelve thousand, two hundred twenty-one".