121000220021 has 8 divisors (see below), whose sum is σ = 122710521024. Its totient is φ = 119290087840.

The previous prime is 121000220009. The next prime is 121000220041. The reversal of 121000220021 is 120022000121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121000220021 - 2³⁰ = 119926478197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121000219984 and 121000220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000220041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2357585 + ... + 2408361.

It is an arithmetic number, because the mean of its divisors is an integer number (15338815128).

Almost surely, 2^121000220021 is an apocalyptic number.

It is an amenable number.

121000220021 is a deficient number, since it is larger than the sum of its proper divisors (1710301003).

121000220021 is an equidigital number, since it uses as much as digits as its factorization.

121000220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84411.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 121000220021 its reverse (120022000121), we get a palindrome (241022220142).

The spelling of 121000220021 in words is "one hundred twenty-one billion, two hundred twenty thousand, twenty-one".