881521221 has 24 divisors (see below), whose sum is σ = 1368474240. Its totient is φ = 503278272.

The previous prime is 881521217. The next prime is 881521231. The reversal of 881521221 is 122125188.

It is not a de Polignac number, because 881521221 - 2² = 881521217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (881521231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234660 + ... + 238386.

It is an arithmetic number, because the mean of its divisors is an integer number (57019760).

Almost surely, 2^881521221 is an apocalyptic number.

It is an amenable number.

881521221 is a deficient number, since it is larger than the sum of its proper divisors (486953019).

881521221 is a wasteful number, since it uses less digits than its factorization.

881521221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5353 (or 5346 counting only the distinct ones).

The product of its digits is 2560, while the sum is 30.

The square root of 881521221 is about 29690.4230518866. The cubic root of 881521221 is about 958.8358360018.

The spelling of 881521221 in words is "eight hundred eighty-one million, five hundred twenty-one thousand, two hundred twenty-one".