11100210121221 has 32 divisors (see below), whose sum is σ = 16491719784960. Its totient is φ = 6594012708864.

The previous prime is 11100210121219. The next prime is 11100210121241. The reversal of 11100210121221 is 12212101200111.

It is a happy number.

It is not a de Polignac number, because 11100210121221 - 2¹ = 11100210121219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11100210121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11100210121241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4597765 + ... + 6583301.

It is an arithmetic number, because the mean of its divisors is an integer number (515366243280).

Almost surely, 2^{11100210121221} is an apocalyptic number.

It is an amenable number.

11100210121221 is a deficient number, since it is larger than the sum of its proper divisors (5391509663739).

11100210121221 is a wasteful number, since it uses less digits than its factorization.

11100210121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990525.

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

Adding to 11100210121221 its reverse (12212101200111), we get a palindrome (23312311321332).

The spelling of 11100210121221 in words is "eleven trillion, one hundred billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".