121221010021 has 8 divisors (see below), whose sum is σ = 127682942400. Its totient is φ = 114767265600.

The previous prime is 121221010007. The next prime is 121221010039. The reversal of 121221010021 is 120010122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121221010021 - 2⁹ = 121221009509 is a prime.

It is a super-2 number, since 2×121221010021² (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 = 121221009983 and 121221010010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221010061) 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 7 ways as a sum of consecutive naturals, for example, 2016580 + ... + 2075821.

It is an arithmetic number, because the mean of its divisors is an integer number (15960367800).

Almost surely, 2^121221010021 is an apocalyptic number.

It is an amenable number.

121221010021 is a deficient number, since it is larger than the sum of its proper divisors (6461932379).

121221010021 is a wasteful number, since it uses less digits than its factorization.

121221010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093979.

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

Adding to 121221010021 its reverse (120010122121), we get a palindrome (241231132142).

The spelling of 121221010021 in words is "one hundred twenty-one billion, two hundred twenty-one million, ten thousand, twenty-one".