32457221 has 2 divisors, whose sum is σ = 32457222. Its totient is φ = 32457220.

The previous prime is 32457211. The next prime is 32457223. The reversal of 32457221 is 12275423.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25140196 + 7317025 = 5014^2 + 2705^2 .

It is an emirp because it is prime and its reverse (12275423) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 32457221 - 2¹⁸ = 32195077 is a prime.

Together with 32457223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (32457223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16228610 + 16228611.

It is an arithmetic number, because the mean of its divisors is an integer number (16228611).

Almost surely, 2^32457221 is an apocalyptic number.

It is an amenable number.

32457221 is a deficient number, since it is larger than the sum of its proper divisors (1).

32457221 is an equidigital number, since it uses as much as digits as its factorization.

32457221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 26.

The square root of 32457221 is about 5697.1239235249. The cubic root of 32457221 is about 318.9851344114.

The spelling of 32457221 in words is "thirty-two million, four hundred fifty-seven thousand, two hundred twenty-one".