52221290 has 32 divisors (see below), whose sum is σ = 105053760. Its totient is φ = 18524800.

The previous prime is 52221289. The next prime is 52221317. The reversal of 52221290 is 9212225.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1280 + ... + 10299.

It is an arithmetic number, because the mean of its divisors is an integer number (3282930).

Almost surely, 2^52221290 is an apocalyptic number.

52221290 is an abundant number, since it is smaller than the sum of its proper divisors (52832470).

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

52221290 is a wasteful number, since it uses less digits than its factorization.

52221290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11638.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 52221290 is about 7226.4299622981. The cubic root of 52221290 is about 373.7798326690.

It can be divided in two parts, 522 and 21290, that added together give a palindrome (21812).

The spelling of 52221290 in words is "fifty-two million, two hundred twenty-one thousand, two hundred ninety".