21430244898 has 64 divisors (see below), whose sum is σ = 49470220800. Its totient is φ = 6868350720.

The previous prime is 21430244887. The next prime is 21430244911. The reversal of 21430244898 is 89844203412.

21430244898 is a `hidden beast` number, since 2 + 143 + 0 + 24 + 489 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 349015 + ... + 405797.

It is an arithmetic number, because the mean of its divisors is an integer number (772972200).

Almost surely, 2^21430244898 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21430244898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24735110400).

21430244898 is an abundant number, since it is smaller than the sum of its proper divisors (28039975902).

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

21430244898 is a wasteful number, since it uses less digits than its factorization.

21430244898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57064 (or 57058 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 21430244898 in words is "twenty-one billion, four hundred thirty million, two hundred forty-four thousand, eight hundred ninety-eight".