422153821 has 2 divisors, whose sum is σ = 422153822. Its totient is φ = 422153820.

The previous prime is 422153807. The next prime is 422153857. The reversal of 422153821 is 128351224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235284921 + 186868900 = 15339^2 + 13670^2 .

It is a cyclic number.

It is not a de Polignac number, because 422153821 - 2⁹ = 422153309 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 422153821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422103821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211076910 + 211076911.

It is an arithmetic number, because the mean of its divisors is an integer number (211076911).

Almost surely, 2^422153821 is an apocalyptic number.

It is an amenable number.

422153821 is a deficient number, since it is larger than the sum of its proper divisors (1).

422153821 is an equidigital number, since it uses as much as digits as its factorization.

422153821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 422153821 is about 20546.3821876261. The cubic root of 422153821 is about 750.1651908726.

The spelling of 422153821 in words is "four hundred twenty-two million, one hundred fifty-three thousand, eight hundred twenty-one".