147521421 has 12 divisors (see below), whose sum is σ = 213277948. Its totient is φ = 98259264.

The previous prime is 147521411. The next prime is 147521443. The reversal of 147521421 is 124125741.

It can be written as a sum of positive squares in 2 ways, for example, as 34928100 + 112593321 = 5910^2 + 10611^2 .

It is not a de Polignac number, because 147521421 - 2⁵ = 147521389 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 (147521401) 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 11 ways as a sum of consecutive naturals, for example, 4161 + ... + 17673.

Almost surely, 2^147521421 is an apocalyptic number.

It is an amenable number.

147521421 is a deficient number, since it is larger than the sum of its proper divisors (65756527).

147521421 is a wasteful number, since it uses less digits than its factorization.

147521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14732 (or 14729 counting only the distinct ones).

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

The square root of 147521421 is about 12145.8396580887. The cubic root of 147521421 is about 528.3864788351.

The spelling of 147521421 in words is "one hundred forty-seven million, five hundred twenty-one thousand, four hundred twenty-one".