121720586 has 8 divisors (see below), whose sum is σ = 196625604. Its totient is φ = 56178720.

The previous prime is 121720519. The next prime is 121720591. The reversal of 121720586 is 685027121.

It can be written as a sum of positive squares in 2 ways, for example, as 114597025 + 7123561 = 10705^2 + 2669^2 .

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

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, 2340755 + ... + 2340806.

Almost surely, 2^121720586 is an apocalyptic number.

121720586 is a deficient number, since it is larger than the sum of its proper divisors (74905018).

121720586 is a wasteful number, since it uses less digits than its factorization.

121720586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4681576.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 121720586 is about 11032.7052892752. The cubic root of 121720586 is about 495.5886423071.

The spelling of 121720586 in words is "one hundred twenty-one million, seven hundred twenty thousand, five hundred eighty-six".