121100211001221 has 16 divisors (see below), whose sum is σ = 162357502049280. Its totient is φ = 80288432276480.

The previous prime is 121100211001199. The next prime is 121100211001223. The reversal of 121100211001221 is 122100112001121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121100211001221 - 2³³ = 121091621066629 is a prime.

It is a super-2 number, since 2×121100211001221² (a number of 29 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 121100211001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100211001223) 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, 27351756 + ... + 31469333.

It is an arithmetic number, because the mean of its divisors is an integer number (10147343878080).

Almost surely, 2^{121100211001221} is an apocalyptic number.

It is an amenable number.

121100211001221 is a deficient number, since it is larger than the sum of its proper divisors (41257291048059).

121100211001221 is a wasteful number, since it uses less digits than its factorization.

121100211001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58824876.

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

Adding to 121100211001221 its reverse (122100112001121), we get a palindrome (243200323002342).

The spelling of 121100211001221 in words is "one hundred twenty-one trillion, one hundred billion, two hundred eleven million, one thousand, two hundred twenty-one".