122857421 has 4 divisors (see below), whose sum is σ = 128199072. Its totient is φ = 117515772.

The previous prime is 122857417. The next prime is 122857429. The reversal of 122857421 is 124758221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122857421 - 2² = 122857417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122857429) 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, 2670791 + ... + 2670836.

It is an arithmetic number, because the mean of its divisors is an integer number (32049768).

Almost surely, 2^122857421 is an apocalyptic number.

It is an amenable number.

122857421 is a deficient number, since it is larger than the sum of its proper divisors (5341651).

122857421 is an equidigital number, since it uses as much as digits as its factorization.

122857421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5341650.

The product of its digits is 8960, while the sum is 32.

The square root of 122857421 is about 11084.1066847987. The cubic root of 122857421 is about 497.1267484785.

The spelling of 122857421 in words is "one hundred twenty-two million, eight hundred fifty-seven thousand, four hundred twenty-one".