21698196 has 24 divisors (see below), whose sum is σ = 54524064. Its totient is φ = 6676320.

The previous prime is 21698191. The next prime is 21698203. The reversal of 21698196 is 69189612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21698191) by changing a digit.

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, 69390 + ... + 69701.

It is an arithmetic number, because the mean of its divisors is an integer number (2271836).

Almost surely, 2^21698196 is an apocalyptic number.

21698196 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21698196 is an abundant number, since it is smaller than the sum of its proper divisors (32825868).

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

21698196 is a wasteful number, since it uses less digits than its factorization.

21698196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139111 (or 139109 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 21698196 is about 4658.1322437217. The cubic root of 21698196 is about 278.9167156765.

The spelling of 21698196 in words is "twenty-one million, six hundred ninety-eight thousand, one hundred ninety-six".