1478663221 has 4 divisors (see below), whose sum is σ = 1689900832. Its totient is φ = 1267425612.

The previous prime is 1478663189. The next prime is 1478663233. The reversal of 1478663221 is 1223668741.

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 1478663221 - 2⁵ = 1478663189 is a prime.

It is a super-2 number, since 2×1478663221² = 4372889842276189682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1478663521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105618795 + ... + 105618808.

It is an arithmetic number, because the mean of its divisors is an integer number (422475208).

Almost surely, 2^1478663221 is an apocalyptic number.

It is an amenable number.

1478663221 is a deficient number, since it is larger than the sum of its proper divisors (211237611).

1478663221 is an equidigital number, since it uses as much as digits as its factorization.

1478663221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211237610.

The product of its digits is 96768, while the sum is 40.

The square root of 1478663221 is about 38453.3902406537. The cubic root of 1478663221 is about 1139.2606319405.

The spelling of 1478663221 in words is "one billion, four hundred seventy-eight million, six hundred sixty-three thousand, two hundred twenty-one".