121200304431 has 4 divisors (see below), whose sum is σ = 161600405912. Its totient is φ = 80800202952.

The previous prime is 121200304427. The next prime is 121200304469. The reversal of 121200304431 is 134403002121.

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

It is not a de Polignac number, because 121200304431 - 2² = 121200304427 is a prime.

It is a super-2 number, since 2×121200304431² (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 = 121200304398 and 121200304407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200304231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20200050736 + ... + 20200050741.

It is an arithmetic number, because the mean of its divisors is an integer number (40400101478).

Almost surely, 2^121200304431 is an apocalyptic number.

121200304431 is a deficient number, since it is larger than the sum of its proper divisors (40400101481).

121200304431 is an equidigital number, since it uses as much as digits as its factorization.

121200304431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40400101480.

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

Adding to 121200304431 its reverse (134403002121), we get a palindrome (255603306552).

The spelling of 121200304431 in words is "one hundred twenty-one billion, two hundred million, three hundred four thousand, four hundred thirty-one".