1421440221 has 8 divisors (see below), whose sum is σ = 1912026240. Its totient is φ = 939240512.

The previous prime is 1421440219. The next prime is 1421440247. The reversal of 1421440221 is 1220441241.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1421440221 - 2¹ = 1421440219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421440291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2096181 + ... + 2096858.

It is an arithmetic number, because the mean of its divisors is an integer number (239003280).

Almost surely, 2^1421440221 is an apocalyptic number.

It is an amenable number.

1421440221 is a deficient number, since it is larger than the sum of its proper divisors (490586019).

1421440221 is a wasteful number, since it uses less digits than its factorization.

1421440221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4193155.

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1421440221 is about 37701.9922683139. The cubic root of 1421440221 is about 1124.3707351008.

Adding to 1421440221 its reverse (1220441241), we get a palindrome (2641881462).

The spelling of 1421440221 in words is "one billion, four hundred twenty-one million, four hundred forty thousand, two hundred twenty-one".