201121120000021 has 8 divisors (see below), whose sum is σ = 218245349244384. Its totient is φ = 184233087021360.

The previous prime is 201121120000019. The next prime is 201121120000057. The reversal of 201121120000021 is 120000021121102.

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

It is not a de Polignac number, because 201121120000021 - 2¹ = 201121120000019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201121119999956 and 201121120000010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121120000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59049064651 + ... + 59049068056.

It is an arithmetic number, because the mean of its divisors is an integer number (27280668655548).

Almost surely, 2^{201121120000021} is an apocalyptic number.

It is an amenable number.

201121120000021 is a deficient number, since it is larger than the sum of its proper divisors (17124229244363).

201121120000021 is a wasteful number, since it uses less digits than its factorization.

201121120000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118098132851.

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

Adding to 201121120000021 its reverse (120000021121102), we get a palindrome (321121141121123).

The spelling of 201121120000021 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred twenty million, twenty-one", and thus it is an aban number.