52211721 has 8 divisors (see below), whose sum is σ = 69854400. Its totient is φ = 34688432.

The previous prime is 52211707. The next prime is 52211741. The reversal of 52211721 is 12711225.

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

It is a cyclic number.

It is not a de Polignac number, because 52211721 - 2¹⁵ = 52178953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52211741) 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, 28821 + ... + 30578.

It is an arithmetic number, because the mean of its divisors is an integer number (8731800).

Almost surely, 2^52211721 is an apocalyptic number.

It is an amenable number.

52211721 is a deficient number, since it is larger than the sum of its proper divisors (17642679).

52211721 is a wasteful number, since it uses less digits than its factorization.

52211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59695.

The product of its digits is 280, while the sum is 21.

The square root of 52211721 is about 7225.7678484712. The cubic root of 52211721 is about 373.7570008718.

Adding to 52211721 its reverse (12711225), we get a palindrome (64922946).

The spelling of 52211721 in words is "fifty-two million, two hundred eleven thousand, seven hundred twenty-one".