21896738 has 16 divisors (see below), whose sum is σ = 33638976. Its totient is φ = 10686000.

The previous prime is 21896717. The next prime is 21896767. The reversal of 21896738 is 83769812.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 26195 + ... + 27017.

It is an arithmetic number, because the mean of its divisors is an integer number (2102436).

Almost surely, 2^21896738 is an apocalyptic number.

21896738 is a deficient number, since it is larger than the sum of its proper divisors (11742238).

21896738 is a wasteful number, since it uses less digits than its factorization.

21896738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129.

The product of its digits is 145152, while the sum is 44.

The square root of 21896738 is about 4679.3950463708. The cubic root of 21896738 is about 279.7648450800.

The spelling of 21896738 in words is "twenty-one million, eight hundred ninety-six thousand, seven hundred thirty-eight".