121705636 has 12 divisors (see below), whose sum is σ = 229368412. Its totient is φ = 56171808.

The previous prime is 121705603. The next prime is 121705651. The reversal of 121705636 is 636507121.

It can be written as a sum of positive squares in 2 ways, for example, as 69056100 + 52649536 = 8310^2 + 7256^2 .

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 121705598 and 121705607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170195 + ... + 1170298.

Almost surely, 2^121705636 is an apocalyptic number.

It is an amenable number.

121705636 is a deficient number, since it is larger than the sum of its proper divisors (107662776).

121705636 is a wasteful number, since it uses less digits than its factorization.

121705636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2340510 (or 2340508 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 121705636 is about 11032.0277374561. The cubic root of 121705636 is about 495.5683517005.

The spelling of 121705636 in words is "one hundred twenty-one million, seven hundred five thousand, six hundred thirty-six".