21889206 has 12 divisors (see below), whose sum is σ = 47426652. Its totient is φ = 7296396.

The previous prime is 21889187. The next prime is 21889207. The reversal of 21889206 is 60298812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 608016 + ... + 608051.

It is an arithmetic number, because the mean of its divisors is an integer number (3952221).

Almost surely, 2^21889206 is an apocalyptic number.

21889206 is an abundant number, since it is smaller than the sum of its proper divisors (25537446).

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

21889206 is a wasteful number, since it uses less digits than its factorization.

21889206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216075 (or 1216072 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 21889206 is about 4678.5901722634. The cubic root of 21889206 is about 279.7327637343.

The spelling of 21889206 in words is "twenty-one million, eight hundred eighty-nine thousand, two hundred six".