21454998 has 32 divisors (see below), whose sum is σ = 45225216. Its totient is φ = 6772128.

The previous prime is 21454997. The next prime is 21455011. The reversal of 21454998 is 89945412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14040 + ... + 15492.

It is an arithmetic number, because the mean of its divisors is an integer number (1413288).

Almost surely, 2^21454998 is an apocalyptic number.

21454998 is an abundant number, since it is smaller than the sum of its proper divisors (23770218).

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

21454998 is a wasteful number, since it uses less digits than its factorization.

21454998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1588.

The product of its digits is 103680, while the sum is 42.

The square root of 21454998 is about 4631.9540153158. The cubic root of 21454998 is about 277.8707454270.

The spelling of 21454998 in words is "twenty-one million, four hundred fifty-four thousand, nine hundred ninety-eight".