122800021 has 8 divisors (see below), whose sum is σ = 133433600. Its totient is φ = 112583520.

The previous prime is 122800019. The next prime is 122800039. The reversal of 122800021 is 120008221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122800021 - 2¹ = 122800019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 122799968 and 122800004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122800121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103656 + ... + 104833.

It is an arithmetic number, because the mean of its divisors is an integer number (16679200).

Almost surely, 2^122800021 is an apocalyptic number.

It is an amenable number.

122800021 is a deficient number, since it is larger than the sum of its proper divisors (10633579).

122800021 is a wasteful number, since it uses less digits than its factorization.

122800021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208539.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 122800021 is about 11081.5170892798. The cubic root of 122800021 is about 497.0493158464.

Adding to 122800021 its reverse (120008221), we get a palindrome (242808242).

The spelling of 122800021 in words is "one hundred twenty-two million, eight hundred thousand, twenty-one".