21940298 has 16 divisors (see below), whose sum is σ = 35527680. Its totient is φ = 10130736.

The previous prime is 21940291. The next prime is 21940309. The reversal of 21940298 is 89204912.

It is not an unprimeable number, because it can be changed into a prime (21940291) 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 7 ways as a sum of consecutive naturals, for example, 6890 + ... + 9557.

It is an arithmetic number, because the mean of its divisors is an integer number (2220480).

Almost surely, 2^21940298 is an apocalyptic number.

21940298 is a deficient number, since it is larger than the sum of its proper divisors (13587382).

21940298 is a wasteful number, since it uses less digits than its factorization.

21940298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16501.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 21940298 is about 4684.0471816582. The cubic root of 21940298 is about 279.9502377553.

The spelling of 21940298 in words is "twenty-one million, nine hundred forty thousand, two hundred ninety-eight".