201121101120021 has 32 divisors (see below), whose sum is σ = 277744547635200. Its totient is φ = 129300413161920.

The previous prime is 201121101119977. The next prime is 201121101120059. The reversal of 201121101120021 is 120021101121102.

It is a happy number.

It is not a de Polignac number, because 201121101120021 - 2⁷ = 201121101119893 is a prime.

It is a super-3 number, since 3×201121101120021³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121101122021) 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 31 ways as a sum of consecutive naturals, for example, 1987174600 + ... + 1987275806.

It is an arithmetic number, because the mean of its divisors is an integer number (8679517113600).

Almost surely, 2^{201121101120021} is an apocalyptic number.

It is an amenable number.

201121101120021 is a deficient number, since it is larger than the sum of its proper divisors (76623446515179).

201121101120021 is a wasteful number, since it uses less digits than its factorization.

201121101120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128689.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 201121101120021 its reverse (120021101121102), we get a palindrome (321142202241123).

The spelling of 201121101120021 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty thousand, twenty-one".