421522 has 4 divisors (see below), whose sum is σ = 632286. Its totient is φ = 210760.

The previous prime is 421517. The next prime is 421559. The reversal of 421522 is 225124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 326041 + 95481 = 571^2 + 309^2 .

It is a junction number, because it is equal to n+sod(n) for n = 421496 and 421505.

It is an unprimeable number.

421522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105379 + ... + 105382.

2⁴²¹⁵²² is an apocalyptic number.

421522 is a deficient number, since it is larger than the sum of its proper divisors (210764).

421522 is a wasteful number, since it uses less digits than its factorization.

421522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210763.

The product of its digits is 160, while the sum is 16.

The square root of 421522 is about 649.2472564440. The cubic root of 421522 is about 74.9790756443.

Adding to 421522 its reverse (225124), we get a palindrome (646646).

The spelling of 421522 in words is "four hundred twenty-one thousand, five hundred twenty-two".