121022100221 has 16 divisors (see below), whose sum is σ = 136158240768. Its totient is φ = 106615278000.

The previous prime is 121022100217. The next prime is 121022100229. The reversal of 121022100221 is 122001220121.

It is not a de Polignac number, because 121022100221 - 2² = 121022100217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121022100196 and 121022100205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121022100229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 947255 + ... + 1067396.

It is an arithmetic number, because the mean of its divisors is an integer number (8509890048).

Almost surely, 2^121022100221 is an apocalyptic number.

121022100221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121022100221 is a deficient number, since it is larger than the sum of its proper divisors (15136140547).

121022100221 is a wasteful number, since it uses less digits than its factorization.

121022100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2014832.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121022100221 its reverse (122001220121), we get a palindrome (243023320342).

The spelling of 121022100221 in words is "one hundred twenty-one billion, twenty-two million, one hundred thousand, two hundred twenty-one".