121321213431 has 32 divisors (see below), whose sum is σ = 177608775168. Its totient is φ = 73053402240.

The previous prime is 121321213373. The next prime is 121321213457. The reversal of 121321213431 is 134312123121.

It is not a de Polignac number, because 121321213431 - 2⁹ = 121321212919 is a prime.

It is a super-2 number, since 2×121321213431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121321213331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4817685 + ... + 4842801.

It is an arithmetic number, because the mean of its divisors is an integer number (5550274224).

Almost surely, 2^121321213431 is an apocalyptic number.

121321213431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121321213431 is a deficient number, since it is larger than the sum of its proper divisors (56287561737).

121321213431 is a wasteful number, since it uses less digits than its factorization.

121321213431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26071.

The product of its digits is 864, while the sum is 24.

Adding to 121321213431 its reverse (134312123121), we get a palindrome (255633336552).

The spelling of 121321213431 in words is "one hundred twenty-one billion, three hundred twenty-one million, two hundred thirteen thousand, four hundred thirty-one".