53478221 has 2 divisors, whose sum is σ = 53478222. Its totient is φ = 53478220.

The previous prime is 53478199. The next prime is 53478223. The reversal of 53478221 is 12287435.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45292900 + 8185321 = 6730^2 + 2861^2 .

It is a cyclic number.

It is not a de Polignac number, because 53478221 - 2¹⁰ = 53477197 is a prime.

Together with 53478223, 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 (53478223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26739110 + 26739111.

It is an arithmetic number, because the mean of its divisors is an integer number (26739111).

Almost surely, 2^53478221 is an apocalyptic number.

It is an amenable number.

53478221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53478221 is an equidigital number, since it uses as much as digits as its factorization.

53478221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 32.

The square root of 53478221 is about 7312.8804858277. The cubic root of 53478221 is about 376.7549646374.

The spelling of 53478221 in words is "fifty-three million, four hundred seventy-eight thousand, two hundred twenty-one".