121121220101021 has 16 divisors (see below), whose sum is σ = 142890525278208. Its totient is φ = 100468529074800.

The previous prime is 121121220100997. The next prime is 121121220101059. The reversal of 121121220101021 is 120101022121121.

It is a cyclic number.

It is not a de Polignac number, because 121121220101021 - 2³⁰ = 121120146359197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121220103021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31290626 + ... + 34947756.

It is an arithmetic number, because the mean of its divisors is an integer number (8930657829888).

Almost surely, 2^{121121220101021} is an apocalyptic number.

It is an amenable number.

121121220101021 is a deficient number, since it is larger than the sum of its proper divisors (21769305177187).

121121220101021 is a wasteful number, since it uses less digits than its factorization.

121121220101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3809792.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121121220101021 its reverse (120101022121121), we get a palindrome (241222242222142).

The spelling of 121121220101021 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred one thousand, twenty-one".