201220012011121 has 4 divisors (see below), whose sum is σ = 207710980140544. Its totient is φ = 194729043881700.

The previous prime is 201220012011113. The next prime is 201220012011127. The reversal of 201220012011121 is 121110210022102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 201220012011121 - 2³ = 201220012011113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201220012011095 and 201220012011104.

It is not an unprimeable number, because it can be changed into a prime (201220012011127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3245484064665 + ... + 3245484064726.

It is an arithmetic number, because the mean of its divisors is an integer number (51927745035136).

Almost surely, 2^{201220012011121} is an apocalyptic number.

It is an amenable number.

201220012011121 is a deficient number, since it is larger than the sum of its proper divisors (6490968129423).

201220012011121 is an equidigital number, since it uses as much as digits as its factorization.

201220012011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490968129422.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 201220012011121 its reverse (121110210022102), we get a palindrome (322330222033223).

It can be divided in two parts, 20122001 and 2011121, that added together give a palindrome (22133122).

The spelling of 201220012011121 in words is "two hundred one trillion, two hundred twenty billion, twelve million, eleven thousand, one hundred twenty-one".