121639435 has 4 divisors (see below), whose sum is σ = 145967328. Its totient is φ = 97311544.

The previous prime is 121639417. The next prime is 121639439. The reversal of 121639435 is 534936121.

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

It is a cyclic number.

It is not a de Polignac number, because 121639435 - 2¹⁹ = 121115147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121639435.

It is not an unprimeable number, because it can be changed into a prime (121639439) 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, 12163939 + ... + 12163948.

It is an arithmetic number, because the mean of its divisors is an integer number (36491832).

Almost surely, 2^121639435 is an apocalyptic number.

121639435 is a deficient number, since it is larger than the sum of its proper divisors (24327893).

121639435 is an equidigital number, since it uses as much as digits as its factorization.

121639435 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24327892.

The product of its digits is 19440, while the sum is 34.

The square root of 121639435 is about 11029.0269289725. The cubic root of 121639435 is about 495.4784816618.

The spelling of 121639435 in words is "one hundred twenty-one million, six hundred thirty-nine thousand, four hundred thirty-five".