121657427 has 4 divisors (see below), whose sum is σ = 122203200. Its totient is φ = 121111656.

The previous prime is 121657381. The next prime is 121657463. The reversal of 121657427 is 724756121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121657427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121651427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272552 + ... + 272997.

It is an arithmetic number, because the mean of its divisors is an integer number (30550800).

Almost surely, 2^121657427 is an apocalyptic number.

121657427 is a deficient number, since it is larger than the sum of its proper divisors (545773).

121657427 is an equidigital number, since it uses as much as digits as its factorization.

121657427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545772.

The product of its digits is 23520, while the sum is 35.

The square root of 121657427 is about 11029.8425646063. The cubic root of 121657427 is about 495.5029096207.

The spelling of 121657427 in words is "one hundred twenty-one million, six hundred fifty-seven thousand, four hundred twenty-seven".