11112120001221 has 32 divisors (see below), whose sum is σ = 15543062431488. Its totient is φ = 7048173411840.

The previous prime is 11112120001219. The next prime is 11112120001273. The reversal of 11112120001221 is 12210002121111.

It is a happy number.

It is not a de Polignac number, because 11112120001221 - 2¹ = 11112120001219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11112120001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112120001621) 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, 9440131 + ... + 10551791.

It is an arithmetic number, because the mean of its divisors is an integer number (485720700984).

Almost surely, 2^{11112120001221} is an apocalyptic number.

It is an amenable number.

11112120001221 is a deficient number, since it is larger than the sum of its proper divisors (4430942430267).

11112120001221 is a wasteful number, since it uses less digits than its factorization.

11112120001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112461.

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

Adding to 11112120001221 its reverse (12210002121111), we get a palindrome (23322122122332).

The spelling of 11112120001221 in words is "eleven trillion, one hundred twelve billion, one hundred twenty million, one thousand, two hundred twenty-one".