21889446 has 8 divisors (see below), whose sum is σ = 43778904. Its totient is φ = 7296480.

The previous prime is 21889429. The next prime is 21889447. The reversal of 21889446 is 64498812.

It is a sphenic number, since it is the product of 3 distinct primes.

21889446 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21889398 and 21889407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889447) 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, 1824115 + ... + 1824126.

It is an arithmetic number, because the mean of its divisors is an integer number (5472363).

Almost surely, 2^21889446 is an apocalyptic number.

21889446 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.

21889446 is a wasteful number, since it uses less digits than its factorization.

21889446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3648246.

The product of its digits is 110592, while the sum is 42.

The square root of 21889446 is about 4678.6158209453. The cubic root of 21889446 is about 279.7337860893.

The spelling of 21889446 in words is "twenty-one million, eight hundred eighty-nine thousand, four hundred forty-six".