21986202 has 96 divisors (see below), whose sum is σ = 55847232. Its totient is φ = 5730816.

The previous prime is 21986197. The next prime is 21986203. The reversal of 21986202 is 20268912.

It is a self number, because there is not a number n which added to its sum of digits gives 21986202.

It is not an unprimeable number, because it can be changed into a prime (21986203) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 264853 + ... + 264935.

It is an arithmetic number, because the mean of its divisors is an integer number (581742).

Almost surely, 2^21986202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21986202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27923616).

21986202 is an abundant number, since it is smaller than the sum of its proper divisors (33861030).

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

21986202 is a wasteful number, since it uses less digits than its factorization.

21986202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21986202 is about 4688.9446573829. The cubic root of 21986202 is about 280.1453412105.

The spelling of 21986202 in words is "twenty-one million, nine hundred eighty-six thousand, two hundred two".