1522421 has 4 divisors (see below), whose sum is σ = 1529472. Its totient is φ = 1515372.

The previous prime is 1522399. The next prime is 1522427. The reversal of 1522421 is 1242251.

1522421 is nontrivially palindromic in base 8.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1522421 - 2⁶ = 1522357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1522421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1522427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3191 + ... + 3636.

It is an arithmetic number, because the mean of its divisors is an integer number (382368).

2^1522421 is an apocalyptic number.

It is an amenable number.

1522421 is a deficient number, since it is larger than the sum of its proper divisors (7051).

1522421 is an equidigital number, since it uses as much as digits as its factorization.

1522421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050.

The product of its digits is 160, while the sum is 17.

The square root of 1522421 is about 1233.8642550945. The cubic root of 1522421 is about 115.0389534077.

Adding to 1522421 its reverse (1242251), we get a palindrome (2764672).

The spelling of 1522421 in words is "one million, five hundred twenty-two thousand, four hundred twenty-one".