52071721 has 8 divisors (see below), whose sum is σ = 56154560. Its totient is φ = 47999952.

The previous prime is 52071713. The next prime is 52071727. The reversal of 52071721 is 12717025.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 52071721 - 2³ = 52071713 is a prime.

It is a super-2 number, since 2×52071721² = 5422928255803682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52071727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8836 + ... + 13498.

It is an arithmetic number, because the mean of its divisors is an integer number (7019320).

Almost surely, 2^52071721 is an apocalyptic number.

It is an amenable number.

52071721 is a deficient number, since it is larger than the sum of its proper divisors (4082839).

52071721 is a wasteful number, since it uses less digits than its factorization.

52071721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5535.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 52071721 is about 7216.0737939686. The cubic root of 52071721 is about 373.4226390484.

Adding to 52071721 its reverse (12717025), we get a palindrome (64788746).

The spelling of 52071721 in words is "fifty-two million, seventy-one thousand, seven hundred twenty-one".