21143196 has 36 divisors (see below), whose sum is σ = 54054000. Its totient is φ = 6967488.

The previous prime is 21143179. The next prime is 21143197. The reversal of 21143196 is 69134112.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21143197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1501500).

Almost surely, 2^21143196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21143196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27027000).

21143196 is an abundant number, since it is smaller than the sum of its proper divisors (32910804).

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

21143196 is a wasteful number, since it uses less digits than its factorization.

21143196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698 (or 6693 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 21143196 is about 4598.1731154884. The cubic root of 21143196 is about 276.5180879944.

The spelling of 21143196 in words is "twenty-one million, one hundred forty-three thousand, one hundred ninety-six".