121021220021 has 16 divisors (see below), whose sum is σ = 134028820800. Its totient is φ = 108584496768.

The previous prime is 121021219999. The next prime is 121021220027. The reversal of 121021220021 is 120022120121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121021220021 is a prime.

It is a super-2 number, since 2×121021220021² (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 = 121021219978 and 121021220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021220027) 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 15 ways as a sum of consecutive naturals, for example, 818171 + ... + 954696.

It is an arithmetic number, because the mean of its divisors is an integer number (8376801300).

Almost surely, 2^121021220021 is an apocalyptic number.

It is an amenable number.

121021220021 is a deficient number, since it is larger than the sum of its proper divisors (13007600779).

121021220021 is a wasteful number, since it uses less digits than its factorization.

121021220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1773028.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121021220021 its reverse (120022120121), we get a palindrome (241043340142).

The spelling of 121021220021 in words is "one hundred twenty-one billion, twenty-one million, two hundred twenty thousand, twenty-one".