121387705 has 4 divisors (see below), whose sum is σ = 145665252. Its totient is φ = 97110160.

The previous prime is 121387703. The next prime is 121387709. The reversal of 121387705 is 507783121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 67453369 + 53934336 = 8213^2 + 7344^2 .

It is not a de Polignac number, because 121387705 - 2¹ = 121387703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121387703) 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, 12138766 + ... + 12138775.

It is an arithmetic number, because the mean of its divisors is an integer number (36416313).

Almost surely, 2^121387705 is an apocalyptic number.

It is an amenable number.

121387705 is a deficient number, since it is larger than the sum of its proper divisors (24277547).

121387705 is an equidigital number, since it uses as much as digits as its factorization.

121387705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24277546.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 121387705 is about 11017.6088603653. The cubic root of 121387705 is about 495.1364518560.

The spelling of 121387705 in words is "one hundred twenty-one million, three hundred eighty-seven thousand, seven hundred five".