121202100021021 has 4 divisors (see below), whose sum is σ = 161602800028032. Its totient is φ = 80801400014012.

The previous prime is 121202100020993. The next prime is 121202100021031. The reversal of 121202100021021 is 120120001202121.

121202100021021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 121202100021021 - 2¹¹ = 121202100018973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202100021031) 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, 20200350003501 + ... + 20200350003506.

It is an arithmetic number, because the mean of its divisors is an integer number (40400700007008).

Almost surely, 2^{121202100021021} is an apocalyptic number.

It is an amenable number.

121202100021021 is a deficient number, since it is larger than the sum of its proper divisors (40400700007011).

121202100021021 is an equidigital number, since it uses as much as digits as its factorization.

121202100021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40400700007010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121202100021021 its reverse (120120001202121), we get a palindrome (241322101223142).

The spelling of 121202100021021 in words is "one hundred twenty-one trillion, two hundred two billion, one hundred million, twenty-one thousand, twenty-one".