21042098 has 32 divisors (see below), whose sum is σ = 39674880. Its totient is φ = 8130960.

The previous prime is 21042097. The next prime is 21042103. The reversal of 21042098 is 89024012.

It is not an unprimeable number, because it can be changed into a prime (21042097) 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, 20915 + ... + 21897.

It is an arithmetic number, because the mean of its divisors is an integer number (1239840).

Almost surely, 2^21042098 is an apocalyptic number.

21042098 is a deficient number, since it is larger than the sum of its proper divisors (18632782).

21042098 is a wasteful number, since it uses less digits than its factorization.

21042098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21042098 is about 4587.1666636389. The cubic root of 21042098 is about 276.0766520278.

The spelling of 21042098 in words is "twenty-one million, forty-two thousand, ninety-eight".