21459998 has 32 divisors (see below), whose sum is σ = 38320128. Its totient is φ = 8820000.

The previous prime is 21459979. The next prime is 21460003. The reversal of 21459998 is 89995412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85373 + ... + 85623.

It is an arithmetic number, because the mean of its divisors is an integer number (1197504).

Almost surely, 2^21459998 is an apocalyptic number.

21459998 is a deficient number, since it is larger than the sum of its proper divisors (16860130).

21459998 is a wasteful number, since it uses less digits than its factorization.

21459998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488.

The product of its digits is 233280, while the sum is 47.

The square root of 21459998 is about 4632.4937128937. The cubic root of 21459998 is about 277.8923292993.

The spelling of 21459998 in words is "twenty-one million, four hundred fifty-nine thousand, nine hundred ninety-eight".