55221522 has 32 divisors (see below), whose sum is σ = 114739200. Its totient is φ = 17704848.

The previous prime is 55221521. The next prime is 55221533. The reversal of 55221522 is 22512255.

It is a junction number, because it is equal to n+sod(n) for n = 55221492 and 55221501.

It is not an unprimeable number, because it can be changed into a prime (55221521) 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, 14979 + ... + 18297.

It is an arithmetic number, because the mean of its divisors is an integer number (3585600).

Almost surely, 2^55221522 is an apocalyptic number.

55221522 is an abundant number, since it is smaller than the sum of its proper divisors (59517678).

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

55221522 is a wasteful number, since it uses less digits than its factorization.

55221522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430.

The product of its digits is 2000, while the sum is 24.

The square root of 55221522 is about 7431.1184891643. The cubic root of 55221522 is about 380.8051304022.

Adding to 55221522 its reverse (22512255), we get a palindrome (77733777).

The spelling of 55221522 in words is "fifty-five million, two hundred twenty-one thousand, five hundred twenty-two".