21712196 has 24 divisors (see below), whose sum is σ = 43890336. Its totient is φ = 9288320.

The previous prime is 21712169. The next prime is 21712211. The reversal of 21712196 is 69121712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13766 + ... + 15261.

It is an arithmetic number, because the mean of its divisors is an integer number (1828764).

Almost surely, 2^21712196 is an apocalyptic number.

It is an amenable number.

21712196 is an abundant number, since it is smaller than the sum of its proper divisors (22178140).

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

21712196 is a wasteful number, since it uses less digits than its factorization.

21712196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29059 (or 29057 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 21712196 is about 4659.6347496344. The cubic root of 21712196 is about 278.9766898559.

It can be divided in two parts, 21 and 712196, that added together give a palindrome (712217).

The spelling of 21712196 in words is "twenty-one million, seven hundred twelve thousand, one hundred ninety-six".