1428414221 has 4 divisors (see below), whose sum is σ = 1538292252. Its totient is φ = 1318536192.

The previous prime is 1428414217. The next prime is 1428414223. The reversal of 1428414221 is 1224148241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1224148241 = 193 ⋅6342737.

It can be written as a sum of positive squares in 2 ways, for example, as 348568900 + 1079845321 = 18670^2 + 32861^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428414221 - 2² = 1428414217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428414223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54938996 + ... + 54939021.

It is an arithmetic number, because the mean of its divisors is an integer number (384573063).

Almost surely, 2^1428414221 is an apocalyptic number.

It is an amenable number.

1428414221 is a deficient number, since it is larger than the sum of its proper divisors (109878031).

1428414221 is a wasteful number, since it uses less digits than its factorization.

1428414221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109878030.

The product of its digits is 4096, while the sum is 29.

The square root of 1428414221 is about 37794.3675830143. The cubic root of 1428414221 is about 1126.2065661661.

The spelling of 1428414221 in words is "one billion, four hundred twenty-eight million, four hundred fourteen thousand, two hundred twenty-one".