1421504221 has 4 divisors (see below), whose sum is σ = 1459923292. Its totient is φ = 1383085152.

The previous prime is 1421504197. The next prime is 1421504233. The reversal of 1421504221 is 1224051241.

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 1205825625 + 215678596 = 34725^2 + 14686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421504221 - 2¹³ = 1421496029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1421504192 and 1421504201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421504921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19209480 + ... + 19209553.

It is an arithmetic number, because the mean of its divisors is an integer number (364980823).

Almost surely, 2^1421504221 is an apocalyptic number.

It is an amenable number.

1421504221 is a deficient number, since it is larger than the sum of its proper divisors (38419071).

1421504221 is an equidigital number, since it uses as much as digits as its factorization.

1421504221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38419070.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1421504221 is about 37702.8410202733. The cubic root of 1421504221 is about 1124.3876096871.

Adding to 1421504221 its reverse (1224051241), we get a palindrome (2645555462).

The spelling of 1421504221 in words is "one billion, four hundred twenty-one million, five hundred four thousand, two hundred twenty-one".