1223210121 has 64 divisors (see below), whose sum is σ = 2023735296. Its totient is φ = 642297600.

The previous prime is 1223210083. The next prime is 1223210123. The reversal of 1223210121 is 1210123221.

It is not a de Polignac number, because 1223210121 - 2⁶ = 1223210057 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1223210121.

It is not an unprimeable number, because it can be changed into a prime (1223210123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1035151 + ... + 1036331.

It is an arithmetic number, because the mean of its divisors is an integer number (31620864).

Almost surely, 2^1223210121 is an apocalyptic number.

It is an amenable number.

1223210121 is a deficient number, since it is larger than the sum of its proper divisors (800525175).

1223210121 is a wasteful number, since it uses less digits than its factorization.

1223210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1223210121 is about 34974.4209530337. The cubic root of 1223210121 is about 1069.4660978067.

Adding to 1223210121 its reverse (1210123221), we get a palindrome (2433333342).

The spelling of 1223210121 in words is "one billion, two hundred twenty-three million, two hundred ten thousand, one hundred twenty-one".