891115525221 has 8 divisors (see below), whose sum is σ = 1188358664064. Its totient is φ = 593974701600.

The previous prime is 891115525163. The next prime is 891115525243. The reversal of 891115525221 is 122525511198.

It is a happy number.

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

It is not a de Polignac number, because 891115525221 - 2⁷ = 891115525093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891115525121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25558480 + ... + 25593321.

It is an arithmetic number, because the mean of its divisors is an integer number (148544833008).

Almost surely, 2^891115525221 is an apocalyptic number.

It is an amenable number.

891115525221 is a deficient number, since it is larger than the sum of its proper divisors (297243138843).

891115525221 is a wasteful number, since it uses less digits than its factorization.

891115525221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51157611.

The product of its digits is 72000, while the sum is 42.

The spelling of 891115525221 in words is "eight hundred ninety-one billion, one hundred fifteen million, five hundred twenty-five thousand, two hundred twenty-one".