121020101021 has 4 divisors (see below), whose sum is σ = 123971810844. Its totient is φ = 118068391200.

The previous prime is 121020100997. The next prime is 121020101039. The reversal of 121020101021 is 120101020121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120101020121 = 383 ⋅313579687.

It can be written as a sum of positive squares in 2 ways, for example, as 15255955225 + 105764145796 = 123515^2 + 325214^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020101021 - 2¹⁴ = 121020084637 is a prime.

It is a super-2 number, since 2×121020101021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020100993 and 121020101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020101071) 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 3 ways as a sum of consecutive naturals, for example, 1475854850 + ... + 1475854931.

It is an arithmetic number, because the mean of its divisors is an integer number (30992952711).

Almost surely, 2^121020101021 is an apocalyptic number.

It is an amenable number.

121020101021 is a deficient number, since it is larger than the sum of its proper divisors (2951709823).

121020101021 is an equidigital number, since it uses as much as digits as its factorization.

121020101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2951709822.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121020101021 its reverse (120101020121), we get a palindrome (241121121142).

The spelling of 121020101021 in words is "one hundred twenty-one billion, twenty million, one hundred one thousand, twenty-one".