53223721 has 2 divisors, whose sum is σ = 53223722. Its totient is φ = 53223720.

The previous prime is 53223707. The next prime is 53223727. The reversal of 53223721 is 12732235.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47073321 + 6150400 = 6861^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 53223721 - 2⁵ = 53223689 is a prime.

It is not a weakly prime, because it can be changed into another prime (53223727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26611860 + 26611861.

It is an arithmetic number, because the mean of its divisors is an integer number (26611861).

Almost surely, 2^53223721 is an apocalyptic number.

It is an amenable number.

53223721 is a deficient number, since it is larger than the sum of its proper divisors (1).

53223721 is an equidigital number, since it uses as much as digits as its factorization.

53223721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 25.

The square root of 53223721 is about 7295.4589300468. The cubic root of 53223721 is about 376.1563618004.

Adding to 53223721 its reverse (12732235), we get a palindrome (65955956).

The spelling of 53223721 in words is "fifty-three million, two hundred twenty-three thousand, seven hundred twenty-one".