21910798 has 32 divisors (see below), whose sum is σ = 40803840. Its totient is φ = 8592480.

The previous prime is 21910753. The next prime is 21910799. The reversal of 21910798 is 89701912.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21910799) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23383 + ... + 24301.

It is an arithmetic number, because the mean of its divisors is an integer number (1275120).

Almost surely, 2^21910798 is an apocalyptic number.

21910798 is a deficient number, since it is larger than the sum of its proper divisors (18893042).

21910798 is a wasteful number, since it uses less digits than its factorization.

21910798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 21910798 is about 4680.8971362336. The cubic root of 21910798 is about 279.8247117158.

The spelling of 21910798 in words is "twenty-one million, nine hundred ten thousand, seven hundred ninety-eight".