147451221 has 24 divisors (see below), whose sum is σ = 220536576. Its totient is φ = 94835520.

The previous prime is 147451201. The next prime is 147451223. The reversal of 147451221 is 122154741.

147451221 is a `hidden beast` number, since 147 + 4 + 512 + 2 + 1 = 666.

It is not a de Polignac number, because 147451221 - 2⁵ = 147451189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147451223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123001 + ... + 124193.

It is an arithmetic number, because the mean of its divisors is an integer number (9189024).

Almost surely, 2^147451221 is an apocalyptic number.

It is an amenable number.

147451221 is a deficient number, since it is larger than the sum of its proper divisors (73085355).

147451221 is a wasteful number, since it uses less digits than its factorization.

147451221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1670 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 147451221 is about 12142.9494357837. The cubic root of 147451221 is about 528.3026523286.

The spelling of 147451221 in words is "one hundred forty-seven million, four hundred fifty-one thousand, two hundred twenty-one".