21241998 has 12 divisors (see below), whose sum is σ = 46024368. Its totient is φ = 7080660.

The previous prime is 21241991. The next prime is 21242047. The reversal of 21241998 is 89914212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 590038 + ... + 590073.

It is an arithmetic number, because the mean of its divisors is an integer number (3835364).

Almost surely, 2^21241998 is an apocalyptic number.

21241998 is an abundant number, since it is smaller than the sum of its proper divisors (24782370).

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

21241998 is a wasteful number, since it uses less digits than its factorization.

21241998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180119 (or 1180116 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 21241998 is about 4608.9042081605. The cubic root of 21241998 is about 276.9481411431.

The spelling of 21241998 in words is "twenty-one million, two hundred forty-one thousand, nine hundred ninety-eight".