121021201220021 has 16 divisors (see below), whose sum is σ = 131809918500288. Its totient is φ = 110685236064000.

The previous prime is 121021201219943. The next prime is 121021201220033. The reversal of 121021201220021 is 120022102120121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121021201220021 is a prime.

It is a super-2 number, since 2×121021201220021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021201220071) 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 15 ways as a sum of consecutive naturals, for example, 702945155 + ... + 703117296.

It is an arithmetic number, because the mean of its divisors is an integer number (8238119906268).

Almost surely, 2^{121021201220021} is an apocalyptic number.

It is an amenable number.

121021201220021 is a deficient number, since it is larger than the sum of its proper divisors (10788717280267).

121021201220021 is a wasteful number, since it uses less digits than its factorization.

121021201220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406062612.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121021201220021 its reverse (120022102120121), we get a palindrome (241043303340142).

The spelling of 121021201220021 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred one million, two hundred twenty thousand, twenty-one".