21770196 has 24 divisors (see below), whose sum is σ = 58054080. Its totient is φ = 6220032.

The previous prime is 21770179. The next prime is 21770237. The reversal of 21770196 is 69107712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129501 + ... + 129668.

It is an arithmetic number, because the mean of its divisors is an integer number (2418920).

Almost surely, 2^21770196 is an apocalyptic number.

It is an amenable number.

21770196 is an abundant number, since it is smaller than the sum of its proper divisors (36283884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21770196 is a wasteful number, since it uses less digits than its factorization.

21770196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259183 (or 259181 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 33.

The square root of 21770196 is about 4665.8542626190. The cubic root of 21770196 is about 279.2248800361.

The spelling of 21770196 in words is "twenty-one million, seven hundred seventy thousand, one hundred ninety-six".