122722821 has 24 divisors (see below), whose sum is σ = 196068600. Its totient is φ = 73478016.

The previous prime is 122722801. The next prime is 122722823. The reversal of 122722821 is 128227221.

It can be written as a sum of positive squares in 4 ways, for example, as 2030625 + 120692196 = 1425^2 + 10986^2 .

It is not a de Polignac number, because 122722821 - 2⁹ = 122722309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122722823) 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 23 ways as a sum of consecutive naturals, for example, 9846 + ... + 18503.

It is an arithmetic number, because the mean of its divisors is an integer number (8169525).

Almost surely, 2^122722821 is an apocalyptic number.

It is an amenable number.

122722821 is a deficient number, since it is larger than the sum of its proper divisors (73345779).

122722821 is a wasteful number, since it uses less digits than its factorization.

122722821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28405 (or 28402 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 122722821 is about 11078.0332640772. The cubic root of 122722821 is about 496.9451349438.

The spelling of 122722821 in words is "one hundred twenty-two million, seven hundred twenty-two thousand, eight hundred twenty-one".