121211320424431 has 4 divisors (see below), whose sum is σ = 122344136503272. Its totient is φ = 120078504345592.

The previous prime is 121211320424423. The next prime is 121211320424479. The reversal of 121211320424431 is 134424023112121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121211320424431 - 2³ = 121211320424423 is a prime.

It is a super-2 number, since 2×121211320424431² (a number of 29 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 = 121211320424393 and 121211320424402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211320424401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566408039260 + ... + 566408039473.

It is an arithmetic number, because the mean of its divisors is an integer number (30586034125818).

Almost surely, 2^{121211320424431} is an apocalyptic number.

121211320424431 is a deficient number, since it is larger than the sum of its proper divisors (1132816078841).

121211320424431 is a wasteful number, since it uses less digits than its factorization.

121211320424431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132816078840.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 121211320424431 its reverse (134424023112121), we get a palindrome (255635343536552).

The spelling of 121211320424431 in words is "one hundred twenty-one trillion, two hundred eleven billion, three hundred twenty million, four hundred twenty-four thousand, four hundred thirty-one".