53070721 has 6 divisors (see below), whose sum is σ = 58334066. Its totient is φ = 48246000.

The previous prime is 53070709. The next prime is 53070727. The reversal of 53070721 is 12707035.

It can be written as a sum of positive squares in only one way, i.e., 33223696 + 19847025 = 5764^2 + 4455^2 .

It is not a de Polignac number, because 53070721 - 2⁷ = 53070593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53070727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 219180 + ... + 219421.

Almost surely, 2^53070721 is an apocalyptic number.

It is an amenable number.

53070721 is a deficient number, since it is larger than the sum of its proper divisors (5263345).

53070721 is a wasteful number, since it uses less digits than its factorization.

53070721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438623 (or 438612 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 53070721 is about 7284.9654082912. The cubic root of 53070721 is about 375.7955755577.

Adding to 53070721 its reverse (12707035), we get a palindrome (65777756).

The spelling of 53070721 in words is "fifty-three million, seventy thousand, seven hundred twenty-one".