21290196 has 12 divisors (see below), whose sum is σ = 49677152. Its totient is φ = 7096728.

The previous prime is 21290189. The next prime is 21290219. The reversal of 21290196 is 69109212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×21290196³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 887080 + ... + 887103.

Almost surely, 2^21290196 is an apocalyptic number.

It is an amenable number.

21290196 is an abundant number, since it is smaller than the sum of its proper divisors (28386956).

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

21290196 is a wasteful number, since it uses less digits than its factorization.

21290196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1774190 (or 1774188 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 21290196 is about 4614.1300371793. The cubic root of 21290196 is about 277.1574476222.

The spelling of 21290196 in words is "twenty-one million, two hundred ninety thousand, one hundred ninety-six".