121223213431 has 16 divisors (see below), whose sum is σ = 128446677504. Its totient is φ = 114164243424.

The previous prime is 121223213383. The next prime is 121223213443. The reversal of 121223213431 is 134312322121.

It is a cyclic number.

It is not a de Polignac number, because 121223213431 - 2¹⁷ = 121223082359 is a prime.

It is a super-2 number, since 2×121223213431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121223213396 and 121223213405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121223213231) 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 15 ways as a sum of consecutive naturals, for example, 3197221 + ... + 3234913.

It is an arithmetic number, because the mean of its divisors is an integer number (8027917344).

Almost surely, 2^121223213431 is an apocalyptic number.

121223213431 is a deficient number, since it is larger than the sum of its proper divisors (7223464073).

121223213431 is a wasteful number, since it uses less digits than its factorization.

121223213431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39870.

The product of its digits is 1728, while the sum is 25.

Adding to 121223213431 its reverse (134312322121), we get a palindrome (255535535552).

The spelling of 121223213431 in words is "one hundred twenty-one billion, two hundred twenty-three million, two hundred thirteen thousand, four hundred thirty-one".