121543403 has 2 divisors, whose sum is σ = 121543404. Its totient is φ = 121543402.

The previous prime is 121543397. The next prime is 121543441. The reversal of 121543403 is 304345121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121543403 - 2¹⁴ = 121527019 is a prime.

It is not a weakly prime, because it can be changed into another prime (121543453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60771701 + 60771702.

It is an arithmetic number, because the mean of its divisors is an integer number (60771702).

Almost surely, 2^121543403 is an apocalyptic number.

121543403 is a deficient number, since it is larger than the sum of its proper divisors (1).

121543403 is an equidigital number, since it uses as much as digits as its factorization.

121543403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 121543403 is about 11024.6724667901. The cubic root of 121543403 is about 495.3480570818.

Adding to 121543403 its reverse (304345121), we get a palindrome (425888524).

The spelling of 121543403 in words is "one hundred twenty-one million, five hundred forty-three thousand, four hundred three".