221142522 has 16 divisors (see below), whose sum is σ = 445255200. Its totient is φ = 73219152.

The previous prime is 221142521. The next prime is 221142527. The reversal of 221142522 is 225241122.

It is not an unprimeable number, because it can be changed into a prime (221142521) 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, 122788 + ... + 124575.

It is an arithmetic number, because the mean of its divisors is an integer number (27828450).

Almost surely, 2^221142522 is an apocalyptic number.

221142522 is an abundant number, since it is smaller than the sum of its proper divisors (224112678).

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

221142522 is a wasteful number, since it uses less digits than its factorization.

221142522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247517.

The product of its digits is 640, while the sum is 21.

The square root of 221142522 is about 14870.8615083323. The cubic root of 221142522 is about 604.7242984864.

Adding to 221142522 its reverse (225241122), we get a palindrome (446383644).

The spelling of 221142522 in words is "two hundred twenty-one million, one hundred forty-two thousand, five hundred twenty-two".