122404021 has 4 divisors (see below), whose sum is σ = 123616044. Its totient is φ = 121192000.

The previous prime is 122404019. The next prime is 122404033. The reversal of 122404021 is 120404221.

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 100781521 + 21622500 = 10039^2 + 4650^2 .

It is a cyclic number.

It is not a de Polignac number, because 122404021 - 2¹ = 122404019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122403986 and 122404004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122405021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605860 + ... + 606061.

It is an arithmetic number, because the mean of its divisors is an integer number (30904011).

Almost surely, 2^122404021 is an apocalyptic number.

It is an amenable number.

122404021 is a deficient number, since it is larger than the sum of its proper divisors (1212023).

122404021 is a wasteful number, since it uses less digits than its factorization.

122404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212022.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 122404021 is about 11063.6350717113. The cubic root of 122404021 is about 496.5144530530.

Adding to 122404021 its reverse (120404221), we get a palindrome (242808242).

It can be divided in two parts, 12240 and 4021, that added together give a palindrome (16261).

The spelling of 122404021 in words is "one hundred twenty-two million, four hundred four thousand, twenty-one".