121550400431 has 2 divisors, whose sum is σ = 121550400432. Its totient is φ = 121550400430.

The previous prime is 121550400347. The next prime is 121550400463. The reversal of 121550400431 is 134004055121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121550400431 is a prime.

It is a super-2 number, since 2×121550400431² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121550400431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121550400031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775200215 + 60775200216.

It is an arithmetic number, because the mean of its divisors is an integer number (60775200216).

Almost surely, 2^121550400431 is an apocalyptic number.

121550400431 is a deficient number, since it is larger than the sum of its proper divisors (1).

121550400431 is an equidigital number, since it uses as much as digits as its factorization.

121550400431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 121550400431 its reverse (134004055121), we get a palindrome (255554455552).

The spelling of 121550400431 in words is "one hundred twenty-one billion, five hundred fifty million, four hundred thousand, four hundred thirty-one".