822881421 has 12 divisors (see below), whose sum is σ = 1190498400. Its totient is φ = 547714440.

The previous prime is 822881377. The next prime is 822881429. The reversal of 822881421 is 124188228.

822881421 is a `hidden beast` number, since 8 + 228 + 8 + 1 + 421 = 666.

It is not a de Polignac number, because 822881421 - 2¹⁴ = 822865037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (822881429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66771 + ... + 78128.

It is an arithmetic number, because the mean of its divisors is an integer number (99208200).

Almost surely, 2^822881421 is an apocalyptic number.

It is an amenable number.

822881421 is a deficient number, since it is larger than the sum of its proper divisors (367616979).

822881421 is a wasteful number, since it uses less digits than its factorization.

822881421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145536 (or 145533 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 822881421 is about 28685.9097990634. The cubic root of 822881421 is about 937.0852146971.

The spelling of 822881421 in words is "eight hundred twenty-two million, eight hundred eighty-one thousand, four hundred twenty-one".