121231202223 has 24 divisors (see below), whose sum is σ = 166233988368. Its totient is φ = 78586465536.

The previous prime is 121231202221. The next prime is 121231202227. The reversal of 121231202223 is 322202132121.

It is not a de Polignac number, because 121231202223 - 2¹ = 121231202221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121231202223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231202221) 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 23 ways as a sum of consecutive naturals, for example, 7108915 + ... + 7125947.

It is an arithmetic number, because the mean of its divisors is an integer number (6926416182).

Almost surely, 2^121231202223 is an apocalyptic number.

121231202223 is a deficient number, since it is larger than the sum of its proper divisors (45002786145).

121231202223 is a wasteful number, since it uses less digits than its factorization.

121231202223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18843 (or 18806 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 121231202223 its reverse (322202132121), we get a palindrome (443433334344).

The spelling of 121231202223 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred two thousand, two hundred twenty-three".