121100012020221 has 32 divisors (see below), whose sum is σ = 175247402588160. Its totient is φ = 73941315480000.

The previous prime is 121100012020217. The next prime is 121100012020231. The reversal of 121100012020221 is 122020210001121.

It is not a de Polignac number, because 121100012020221 - 2² = 121100012020217 is a prime.

It is a super-2 number, since 2×121100012020221² (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 121100012020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100012020231) 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, 7314055 + ... + 17195796.

It is an arithmetic number, because the mean of its divisors is an integer number (5476481330880).

Almost surely, 2^{121100012020221} is an apocalyptic number.

It is an amenable number.

121100012020221 is a deficient number, since it is larger than the sum of its proper divisors (54147390567939).

121100012020221 is a wasteful number, since it uses less digits than its factorization.

121100012020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24510857.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121100012020221 its reverse (122020210001121), we get a palindrome (243120222021342).

The spelling of 121100012020221 in words is "one hundred twenty-one trillion, one hundred billion, twelve million, twenty thousand, two hundred twenty-one".