21409098 has 16 divisors (see below), whose sum is σ = 43814496. Its totient is φ = 6970320.

The previous prime is 21409061. The next prime is 21409117. The reversal of 21409098 is 89090412.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41233 + ... + 41748.

It is an arithmetic number, because the mean of its divisors is an integer number (2738406).

Almost surely, 2^21409098 is an apocalyptic number.

21409098 is an abundant number, since it is smaller than the sum of its proper divisors (22405398).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21409098 is a wasteful number, since it uses less digits than its factorization.

21409098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83029.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 21409098 is about 4626.9966500960. The cubic root of 21409098 is about 277.6724486110.

The spelling of 21409098 in words is "twenty-one million, four hundred nine thousand, ninety-eight".