21914890 has 8 divisors (see below), whose sum is σ = 39446820. Its totient is φ = 8765952.

The previous prime is 21914857. The next prime is 21914891. The reversal of 21914890 is 9841912.

It can be written as a sum of positive squares in 2 ways, for example, as 20007729 + 1907161 = 4473^2 + 1381^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21914891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1095735 + ... + 1095754.

Almost surely, 2^21914890 is an apocalyptic number.

21914890 is a deficient number, since it is larger than the sum of its proper divisors (17531930).

21914890 is a wasteful number, since it uses less digits than its factorization.

21914890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2191496.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 21914890 is about 4681.3342115256. The cubic root of 21914890 is about 279.8421303944.

The spelling of 21914890 in words is "twenty-one million, nine hundred fourteen thousand, eight hundred ninety".