53051221 has 2 divisors, whose sum is σ = 53051222. Its totient is φ = 53051220.

The previous prime is 53051213. The next prime is 53051227. The reversal of 53051221 is 12215035.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33814225 + 19236996 = 5815^2 + 4386^2 .

It is a cyclic number.

It is not a de Polignac number, because 53051221 - 2³ = 53051213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53051227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26525610 + 26525611.

It is an arithmetic number, because the mean of its divisors is an integer number (26525611).

Almost surely, 2^53051221 is an apocalyptic number.

It is an amenable number.

53051221 is a deficient number, since it is larger than the sum of its proper divisors (1).

53051221 is an equidigital number, since it uses as much as digits as its factorization.

53051221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 53051221 is about 7283.6269124661. The cubic root of 53051221 is about 375.7495431988.

Adding to 53051221 its reverse (12215035), we get a palindrome (65266256).

The spelling of 53051221 in words is "fifty-three million, fifty-one thousand, two hundred twenty-one".