121100221021 has 16 divisors (see below), whose sum is σ = 140427604800. Its totient is φ = 103426023168.

The previous prime is 121100220991. The next prime is 121100221027. The reversal of 121100221021 is 120122001121.

It is not a de Polignac number, because 121100221021 - 2⁹ = 121100220509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121100220992 and 121100221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100221027) 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, 4630731 + ... + 4656808.

It is an arithmetic number, because the mean of its divisors is an integer number (8776725300).

Almost surely, 2^121100221021 is an apocalyptic number.

It is an amenable number.

121100221021 is a deficient number, since it is larger than the sum of its proper divisors (19327383779).

121100221021 is a wasteful number, since it uses less digits than its factorization.

121100221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9287628.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121100221021 its reverse (120122001121), we get a palindrome (241222222142).

The spelling of 121100221021 in words is "one hundred twenty-one billion, one hundred million, two hundred twenty-one thousand, twenty-one".