122816021 has 4 divisors (see below), whose sum is σ = 128155872. Its totient is φ = 117476172.

The previous prime is 122816011. The next prime is 122816027. The reversal of 122816021 is 120618221.

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 122816021 - 2¹⁰ = 122814997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 5339827 = 122816021 / (1 + 2 + 2 + 8 + 1 + 6 + 0 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122816027) 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, 2669891 + ... + 2669936.

It is an arithmetic number, because the mean of its divisors is an integer number (32038968).

Almost surely, 2^122816021 is an apocalyptic number.

It is an amenable number.

122816021 is a deficient number, since it is larger than the sum of its proper divisors (5339851).

122816021 is an equidigital number, since it uses as much as digits as its factorization.

122816021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5339850.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 122816021 is about 11082.2389885799. The cubic root of 122816021 is about 497.0709022805.

The spelling of 122816021 in words is "one hundred twenty-two million, eight hundred sixteen thousand, twenty-one".