821880141 has 4 divisors (see below), whose sum is σ = 1095840192. Its totient is φ = 547920092.

The previous prime is 821880133. The next prime is 821880151. The reversal of 821880141 is 141088128.

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 821880141 - 2³ = 821880133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821880151) 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 3 ways as a sum of consecutive naturals, for example, 136980021 + ... + 136980026.

It is an arithmetic number, because the mean of its divisors is an integer number (273960048).

Almost surely, 2^821880141 is an apocalyptic number.

It is an amenable number.

821880141 is a deficient number, since it is larger than the sum of its proper divisors (273960051).

821880141 is a wasteful number, since it uses less digits than its factorization.

821880141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273960050.

The product of its (nonzero) digits is 4096, while the sum is 33.

The square root of 821880141 is about 28668.4520161100. The cubic root of 821880141 is about 936.7049794713.

The spelling of 821880141 in words is "eight hundred twenty-one million, eight hundred eighty thousand, one hundred forty-one".