201223121 has 24 divisors (see below), whose sum is σ = 231662592. Its totient is φ = 174468800.

The previous prime is 201223117. The next prime is 201223157. The reversal of 201223121 is 121322102.

It is a happy number.

It is not a de Polignac number, because 201223121 - 2² = 201223117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201223096 and 201223105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201223111) 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 23 ways as a sum of consecutive naturals, for example, 232736 + ... + 233598.

It is an arithmetic number, because the mean of its divisors is an integer number (9652608).

Almost surely, 2^201223121 is an apocalyptic number.

It is an amenable number.

201223121 is a deficient number, since it is larger than the sum of its proper divisors (30439471).

201223121 is a wasteful number, since it uses less digits than its factorization.

201223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 201223121 is about 14185.3135672075. The cubic root of 201223121 is about 585.9932681417.

Adding to 201223121 its reverse (121322102), we get a palindrome (322545223).

It can be divided in two parts, 201 and 223121, that added together give a palindrome (223322).

The spelling of 201223121 in words is "two hundred one million, two hundred twenty-three thousand, one hundred twenty-one".