923421221 has 2 divisors, whose sum is σ = 923421222. Its totient is φ = 923421220.

The previous prime is 923421157. The next prime is 923421241. The reversal of 923421221 is 122124329.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 923308996 + 112225 = 30386^2 + 335^2 .

It is an emirp because it is prime and its reverse (122124329) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 923421221 - 2⁶ = 923421157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (923421241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 461710610 + 461710611.

It is an arithmetic number, because the mean of its divisors is an integer number (461710611).

Almost surely, 2^923421221 is an apocalyptic number.

It is an amenable number.

923421221 is a deficient number, since it is larger than the sum of its proper divisors (1).

923421221 is an equidigital number, since it uses as much as digits as its factorization.

923421221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 923421221 is about 30387.8466002446. The cubic root of 923421221 is about 973.7929295562.

The spelling of 923421221 in words is "nine hundred twenty-three million, four hundred twenty-one thousand, two hundred twenty-one".