21250098 has 24 divisors (see below), whose sum is σ = 47630700. Its totient is φ = 6838944.

The previous prime is 21250067. The next prime is 21250111. The reversal of 21250098 is 89005212.

It can be written as a sum of positive squares in 2 ways, for example, as 21095649 + 154449 = 4593^2 + 393^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19833 + ... + 20876.

Almost surely, 2^21250098 is an apocalyptic number.

21250098 is an abundant number, since it is smaller than the sum of its proper divisors (26380602).

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

21250098 is a wasteful number, since it uses less digits than its factorization.

21250098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40746 (or 40743 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 21250098 is about 4609.7828582266. The cubic root of 21250098 is about 276.9833386304.

The spelling of 21250098 in words is "twenty-one million, two hundred fifty thousand, ninety-eight".