121021201021 has 6 divisors (see below), whose sum is σ = 140779764510. Its totient is φ = 103732457976.

The previous prime is 121021201019. The next prime is 121021201033. The reversal of 121021201021 is 120102120121.

It can be written as a sum of positive squares in only one way, i.e., 113829312996 + 7191888025 = 337386^2 + 84805^2 .

It is not a de Polignac number, because 121021201021 - 2¹ = 121021201019 is a prime.

It is a super-2 number, since 2×121021201021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121021200992 and 121021201010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021201121) 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 5 ways as a sum of consecutive naturals, for example, 1234910166 + ... + 1234910263.

It is an arithmetic number, because the mean of its divisors is an integer number (23463294085).

Almost surely, 2^121021201021 is an apocalyptic number.

It is an amenable number.

121021201021 is a deficient number, since it is larger than the sum of its proper divisors (19758563489).

121021201021 is an equidigital number, since it uses as much as digits as its factorization.

121021201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469820443 (or 2469820436 counting only the distinct ones).

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

Adding to 121021201021 its reverse (120102120121), we get a palindrome (241123321142).

The spelling of 121021201021 in words is "one hundred twenty-one billion, twenty-one million, two hundred one thousand, twenty-one".