21210196 has 12 divisors (see below), whose sum is σ = 42420448. Its totient is φ = 9090072.

The previous prime is 21210193. The next prime is 21210197. The reversal of 21210196 is 69101212.

21210196 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210193) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378726 + ... + 378781.

Almost surely, 2^21210196 is an apocalyptic number.

It is an amenable number.

21210196 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21210196 is a wasteful number, since it uses less digits than its factorization.

21210196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757518 (or 757516 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 21210196 is about 4605.4528550404. The cubic root of 21210196 is about 276.8098631310.

The spelling of 21210196 in words is "twenty-one million, two hundred ten thousand, one hundred ninety-six".