21284093898 has 32 divisors (see below), whose sum is σ = 47321910720. Its totient is φ = 7091109360.

The previous prime is 21284093843. The next prime is 21284093927. The reversal of 21284093898 is 89839048212.

21284093898 is a `hidden beast` number, since 212 + 8 + 40 + 9 + 389 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9153 + ... + 206523.

It is an arithmetic number, because the mean of its divisors is an integer number (1478809710).

Almost surely, 2^21284093898 is an apocalyptic number.

21284093898 is an abundant number, since it is smaller than the sum of its proper divisors (26037816822).

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

21284093898 is a wasteful number, since it uses less digits than its factorization.

21284093898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199379 (or 199373 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 21284093898 in words is "twenty-one billion, two hundred eighty-four million, ninety-three thousand, eight hundred ninety-eight".