121221020020021 has 8 divisors (see below), whose sum is σ = 121765952376320. Its totient is φ = 120676099631472.

The previous prime is 121221020019989. The next prime is 121221020020039. The reversal of 121221020020021 is 120020020122121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121221020020021 - 2⁵ = 121221020019989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221020019977 and 121221020020004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221020020091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17630296 + ... + 23521678.

It is an arithmetic number, because the mean of its divisors is an integer number (15220744047040).

Almost surely, 2^{121221020020021} is an apocalyptic number.

It is an amenable number.

121221020020021 is a deficient number, since it is larger than the sum of its proper divisors (544932356299).

121221020020021 is an equidigital number, since it uses as much as digits as its factorization.

121221020020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5983875.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121221020020021 its reverse (120020020122121), we get a palindrome (241241040142142).

The spelling of 121221020020021 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, twenty thousand, twenty-one".