121020201021 has 4 divisors (see below), whose sum is σ = 161360268032. Its totient is φ = 80680134012.

The previous prime is 121020201011. The next prime is 121020201059. The reversal of 121020201021 is 120102020121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 121020201021 - 2¹⁰ = 121020199997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121020200988 and 121020201006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020201011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20170033501 + ... + 20170033506.

It is an arithmetic number, because the mean of its divisors is an integer number (40340067008).

Almost surely, 2^121020201021 is an apocalyptic number.

It is an amenable number.

121020201021 is a deficient number, since it is larger than the sum of its proper divisors (40340067011).

121020201021 is an equidigital number, since it uses as much as digits as its factorization.

121020201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40340067010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121020201021 its reverse (120102020121), we get a palindrome (241122221142).

The spelling of 121020201021 in words is "one hundred twenty-one billion, twenty million, two hundred one thousand, twenty-one".