1421013221 has 4 divisors (see below), whose sum is σ = 1504602252. Its totient is φ = 1337424192.

The previous prime is 1421013197. The next prime is 1421013227. The reversal of 1421013221 is 1223101241.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1259469121 + 161544100 = 35489^2 + 12710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421013221 - 2¹⁸ = 1420751077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 83589013 = 1421013221 / (1 + 4 + 2 + 1 + 0 + 1 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421013227) 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, 41794490 + ... + 41794523.

It is an arithmetic number, because the mean of its divisors is an integer number (376150563).

Almost surely, 2^1421013221 is an apocalyptic number.

It is an amenable number.

1421013221 is a deficient number, since it is larger than the sum of its proper divisors (83589031).

1421013221 is an equidigital number, since it uses as much as digits as its factorization.

1421013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83589030.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1421013221 is about 37696.3290122526. The cubic root of 1421013221 is about 1124.2581370050.

Adding to 1421013221 its reverse (1223101241), we get a palindrome (2644114462).

The spelling of 1421013221 in words is "one billion, four hundred twenty-one million, thirteen thousand, two hundred twenty-one".