121816635 has 16 divisors (see below), whose sum is σ = 199440384. Its totient is φ = 63457632.

The previous prime is 121816613. The next prime is 121816661. The reversal of 121816635 is 536618121.

It is not a de Polignac number, because 121816635 - 2⁶ = 121816571 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121816596 and 121816605.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93787 + ... + 95076.

It is an arithmetic number, because the mean of its divisors is an integer number (12465024).

Almost surely, 2^121816635 is an apocalyptic number.

121816635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121816635 is a deficient number, since it is larger than the sum of its proper divisors (77623749).

121816635 is a wasteful number, since it uses less digits than its factorization.

121816635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188914.

The product of its digits is 8640, while the sum is 33.

The square root of 121816635 is about 11037.0573523924. The cubic root of 121816635 is about 495.7189633975.

The spelling of 121816635 in words is "one hundred twenty-one million, eight hundred sixteen thousand, six hundred thirty-five".