201121111121021 has 16 divisors (see below), whose sum is σ = 252800349172224. Its totient is φ = 155743072251264.

The previous prime is 201121111121017. The next prime is 201121111121023. The reversal of 201121111121021 is 120121111121102.

It is a cyclic number.

It is not a de Polignac number, because 201121111121021 - 2² = 201121111121017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201121111121023) 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, 23511932960 + ... + 23511941513.

It is an arithmetic number, because the mean of its divisors is an integer number (15800021823264).

Almost surely, 2^{201121111121021} is an apocalyptic number.

It is an amenable number.

201121111121021 is a deficient number, since it is larger than the sum of its proper divisors (51679238051203).

201121111121021 is a wasteful number, since it uses less digits than its factorization.

201121111121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47023874540.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 201121111121021 its reverse (120121111121102), we get a palindrome (321242222242123).

The spelling of 201121111121021 in words is "two hundred one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, twenty-one".