21889078 has 8 divisors (see below), whose sum is σ = 32888520. Its totient is φ = 10926240.

The previous prime is 21889067. The next prime is 21889079. The reversal of 21889078 is 87098812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21889079) 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, 7603 + ... + 10078.

It is an arithmetic number, because the mean of its divisors is an integer number (4111065).

Almost surely, 2^21889078 is an apocalyptic number.

21889078 is a deficient number, since it is larger than the sum of its proper divisors (10999442).

21889078 is a wasteful number, since it uses less digits than its factorization.

21889078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18302.

The product of its (nonzero) digits is 64512, while the sum is 43.

The square root of 21889078 is about 4678.5764929089. The cubic root of 21889078 is about 279.7322184752.

The spelling of 21889078 in words is "twenty-one million, eight hundred eighty-nine thousand, seventy-eight".