521918222 has 16 divisors (see below), whose sum is σ = 897885312. Its totient is φ = 222887160.

The previous prime is 521918209. The next prime is 521918227. The reversal of 521918222 is 222819125.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521918227) 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, 61904 + ... + 69827.

It is an arithmetic number, because the mean of its divisors is an integer number (56117832).

Almost surely, 2^521918222 is an apocalyptic number.

521918222 is a deficient number, since it is larger than the sum of its proper divisors (375967090).

521918222 is a wasteful number, since it uses less digits than its factorization.

521918222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132023.

The product of its digits is 5760, while the sum is 32.

The square root of 521918222 is about 22845.5295845818. The cubic root of 521918222 is about 805.1327389356.

The spelling of 521918222 in words is "five hundred twenty-one million, nine hundred eighteen thousand, two hundred twenty-two".