121543402 has 8 divisors (see below), whose sum is σ = 182722500. Its totient is φ = 60635904.

The previous prime is 121543397. The next prime is 121543403. The reversal of 121543402 is 204345121.

It can be written as a sum of positive squares in 2 ways, for example, as 120802081 + 741321 = 10991^2 + 861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (121543403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66777 + ... + 68572.

Almost surely, 2^121543402 is an apocalyptic number.

121543402 is a deficient number, since it is larger than the sum of its proper divisors (61179098).

121543402 is a wasteful number, since it uses less digits than its factorization.

121543402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135800.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 121543402 is about 11024.6724214373. The cubic root of 121543402 is about 495.3480557233.

Adding to 121543402 its reverse (204345121), we get a palindrome (325888523).

The spelling of 121543402 in words is "one hundred twenty-one million, five hundred forty-three thousand, four hundred two".