122973821 has 2 divisors, whose sum is σ = 122973822. Its totient is φ = 122973820.

The previous prime is 122973811. The next prime is 122973827. The reversal of 122973821 is 128379221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91948921 + 31024900 = 9589^2 + 5570^2 .

It is a cyclic number.

It is not a de Polignac number, because 122973821 - 2¹⁰ = 122972797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122973827) 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 as a sum of consecutive naturals, namely, 61486910 + 61486911.

It is an arithmetic number, because the mean of its divisors is an integer number (61486911).

Almost surely, 2^122973821 is an apocalyptic number.

It is an amenable number.

122973821 is a deficient number, since it is larger than the sum of its proper divisors (1).

122973821 is an equidigital number, since it uses as much as digits as its factorization.

122973821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 122973821 is about 11089.3562031346. The cubic root of 122973821 is about 497.2836981305.

The spelling of 122973821 in words is "one hundred twenty-two million, nine hundred seventy-three thousand, eight hundred twenty-one".