52221540 has 48 divisors (see below), whose sum is σ = 167110272. Its totient is φ = 11936256.

The previous prime is 52221527. The next prime is 52221553. The reversal of 52221540 is 4512225.

It is a happy number.

52221540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (52221527) and next prime (52221553).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61749 + ... + 62588.

It is an arithmetic number, because the mean of its divisors is an integer number (3481464).

Almost surely, 2^52221540 is an apocalyptic number.

It is an amenable number.

52221540 is an abundant number, since it is smaller than the sum of its proper divisors (114888732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

52221540 is a wasteful number, since it uses less digits than its factorization.

52221540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124356 (or 124354 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 52221540 is about 7226.4472598920. The cubic root of 52221540 is about 373.7804291359.

Adding to 52221540 its reverse (4512225), we get a palindrome (56733765).

The spelling of 52221540 in words is "fifty-two million, two hundred twenty-one thousand, five hundred forty".