121020211021 has 4 divisors (see below), whose sum is σ = 121025677500. Its totient is φ = 121014744544.

The previous prime is 121020211009. The next prime is 121020211033. The reversal of 121020211021 is 120112020121.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (121020211009) and next prime (121020211033).

It can be written as a sum of positive squares in 2 ways, for example, as 17602655625 + 103417555396 = 132675^2 + 321586^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020211021 - 2⁵ = 121020210989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020210992 and 121020211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020211321) 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 3 ways as a sum of consecutive naturals, for example, 2699896 + ... + 2744353.

It is an arithmetic number, because the mean of its divisors is an integer number (30256419375).

Almost surely, 2^121020211021 is an apocalyptic number.

It is an amenable number.

121020211021 is a deficient number, since it is larger than the sum of its proper divisors (5466479).

121020211021 is an equidigital number, since it uses as much as digits as its factorization.

121020211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5466478.

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

Adding to 121020211021 its reverse (120112020121), we get a palindrome (241132231142).

The spelling of 121020211021 in words is "one hundred twenty-one billion, twenty million, two hundred eleven thousand, twenty-one".