132821891 has 4 divisors (see below), whose sum is σ = 132848352. Its totient is φ = 132795432.

The previous prime is 132821861. The next prime is 132821903. The reversal of 132821891 is 198128231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198128231 = 7 ⋅28304033.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-132821891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (132821851) 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, 3131 + ... + 16596.

It is an arithmetic number, because the mean of its divisors is an integer number (33212088).

Almost surely, 2^132821891 is an apocalyptic number.

132821891 is a deficient number, since it is larger than the sum of its proper divisors (26461).

132821891 is an equidigital number, since it uses as much as digits as its factorization.

132821891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26460.

The product of its digits is 6912, while the sum is 35.

The square root of 132821891 is about 11524.8380031999. The cubic root of 132821891 is about 510.2189128125.

The spelling of 132821891 in words is "one hundred thirty-two million, eight hundred twenty-one thousand, eight hundred ninety-one".