52221620 has 48 divisors (see below), whose sum is σ = 126681408. Its totient is φ = 17871360.

The previous prime is 52221613. The next prime is 52221623. The reversal of 52221620 is 2612225.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 52221592 and 52221601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52221623) 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, 3242 + ... + 10721.

It is an arithmetic number, because the mean of its divisors is an integer number (2639196).

Almost surely, 2^52221620 is an apocalyptic number.

It is an amenable number.

52221620 is an abundant number, since it is smaller than the sum of its proper divisors (74459788).

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

52221620 is a wasteful number, since it uses less digits than its factorization.

52221620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14000 (or 13998 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 52221620 is about 7226.4527951132. The cubic root of 52221620 is about 373.7806200049.

Adding to 52221620 its reverse (2612225), we get a palindrome (54833845).

The spelling of 52221620 in words is "fifty-two million, two hundred twenty-one thousand, six hundred twenty".