132447821 has 4 divisors (see below), whose sum is σ = 144488544. Its totient is φ = 120407100.

The previous prime is 132447817. The next prime is 132447829. The reversal of 132447821 is 128744231.

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 not a de Polignac number, because 132447821 - 2² = 132447817 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 (132447829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6020345 + ... + 6020366.

It is an arithmetic number, because the mean of its divisors is an integer number (36122136).

Almost surely, 2^132447821 is an apocalyptic number.

132447821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

132447821 is a deficient number, since it is larger than the sum of its proper divisors (12040723).

132447821 is a wasteful number, since it uses less digits than its factorization.

132447821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12040722.

The product of its digits is 10752, while the sum is 32.

The square root of 132447821 is about 11508.5976991117. The cubic root of 132447821 is about 509.7394811951.

The spelling of 132447821 in words is "one hundred thirty-two million, four hundred forty-seven thousand, eight hundred twenty-one".