215280821823 has 8 divisors (see below), whose sum is σ = 287115416448. Its totient is φ = 143483387544.

The previous prime is 215280821797. The next prime is 215280821837. The reversal of 215280821823 is 328128082512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 215280821823 - 2⁶ = 215280821759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215280821843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9276565 + ... + 9299742.

It is an arithmetic number, because the mean of its divisors is an integer number (35889427056).

Almost surely, 2^215280821823 is an apocalyptic number.

215280821823 is a deficient number, since it is larger than the sum of its proper divisors (71834594625).

215280821823 is a wasteful number, since it uses less digits than its factorization.

215280821823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18580173.

The product of its (nonzero) digits is 122880, while the sum is 42.

The spelling of 215280821823 in words is "two hundred fifteen billion, two hundred eighty million, eight hundred twenty-one thousand, eight hundred twenty-three".