52221040 has 80 divisors (see below), whose sum is σ = 128402496. Its totient is φ = 19712000.

The previous prime is 52221031. The next prime is 52221041. The reversal of 52221040 is 4012225.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52221041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 185700 + ... + 185980.

Almost surely, 2^52221040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52221040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64201248).

52221040 is an abundant number, since it is smaller than the sum of its proper divisors (76181456).

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

52221040 is a wasteful number, since it uses less digits than its factorization.

52221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 52221040 is about 7226.4126646629. The cubic root of 52221040 is about 373.7792362002.

Adding to 52221040 its reverse (4012225), we get a palindrome (56233265).

The spelling of 52221040 in words is "fifty-two million, two hundred twenty-one thousand, forty".