21284898 has 16 divisors (see below), whose sum is σ = 44038080. Its totient is φ = 6850256.

The previous prime is 21284839. The next prime is 21284903. The reversal of 21284898 is 89848212.

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, 60990 + ... + 61337.

It is an arithmetic number, because the mean of its divisors is an integer number (2752380).

Almost surely, 2^21284898 is an apocalyptic number.

21284898 is an abundant number, since it is smaller than the sum of its proper divisors (22753182).

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

21284898 is a wasteful number, since it uses less digits than its factorization.

21284898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122361.

The product of its digits is 73728, while the sum is 42.

The square root of 21284898 is about 4613.5558954022. Note that the first 3 decimals coincide. The cubic root of 21284898 is about 277.1344557879.

The spelling of 21284898 in words is "twenty-one million, two hundred eighty-four thousand, eight hundred ninety-eight".