201121102021 has 16 divisors (see below), whose sum is σ = 241963407360. Its totient is φ = 163307467440.

The previous prime is 201121101991. The next prime is 201121102069. The reversal of 201121102021 is 120201121102.

201121102021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 201121102021 - 2¹³ = 201121093829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121101992 and 201121102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121105021) 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 15 ways as a sum of consecutive naturals, for example, 3620760 + ... + 3675886.

It is an arithmetic number, because the mean of its divisors is an integer number (15122712960).

Almost surely, 2^201121102021 is an apocalyptic number.

It is an amenable number.

201121102021 is a deficient number, since it is larger than the sum of its proper divisors (40842305339).

201121102021 is a wasteful number, since it uses less digits than its factorization.

201121102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82584.

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

Adding to 201121102021 its reverse (120201121102), we get a palindrome (321322223123).

The spelling of 201121102021 in words is "two hundred one billion, one hundred twenty-one million, one hundred two thousand, twenty-one".