21882213 has 36 divisors (see below), whose sum is σ = 34482240. Its totient is φ = 13362816.

The previous prime is 21882209. The next prime is 21882221. The reversal of 21882213 is 31228812.

It is not a de Polignac number, because 21882213 - 2² = 21882209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21882253) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 122158 + ... + 122336.

It is an arithmetic number, because the mean of its divisors is an integer number (957840).

Almost surely, 2^21882213 is an apocalyptic number.

It is an amenable number.

21882213 is a deficient number, since it is larger than the sum of its proper divisors (12600027).

21882213 is a wasteful number, since it uses less digits than its factorization.

21882213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 246 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21882213 is about 4677.8427720478. The cubic root of 21882213 is about 279.7029715836.

The spelling of 21882213 in words is "twenty-one million, eight hundred eighty-two thousand, two hundred thirteen".