11012121100221 has 16 divisors (see below), whose sum is σ = 14812944239040. Its totient is φ = 7276357589760.

The previous prime is 11012121100187. The next prime is 11012121100231. The reversal of 11012121100221 is 12200112121011.

It is a happy number.

It is not a de Polignac number, because 11012121100221 - 2⁷ = 11012121100093 is a prime.

It is a super-2 number, since 2×11012121100221² (a number of 27 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 11012121100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012121100231) 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, 39734751 + ... + 40010931.

It is an arithmetic number, because the mean of its divisors is an integer number (925809014940).

Almost surely, 2^{11012121100221} is an apocalyptic number.

It is an amenable number.

11012121100221 is a deficient number, since it is larger than the sum of its proper divisors (3800823138819).

11012121100221 is a wasteful number, since it uses less digits than its factorization.

11012121100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393916.

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

Adding to 11012121100221 its reverse (12200112121011), we get a palindrome (23212233221232).

The spelling of 11012121100221 in words is "eleven trillion, twelve billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".