21143398284 has 72 divisors (see below), whose sum is σ = 56304488240. Its totient is φ = 6671434752.

The previous prime is 21143398273. The next prime is 21143398319. The reversal of 21143398284 is 48289334112.

21143398284 is a `hidden beast` number, since 21 + 14 + 339 + 8 + 284 = 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 23 ways as a sum of consecutive naturals, for example, 875232 + ... + 899064.

Almost surely, 2^21143398284 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21143398284, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28152244120).

21143398284 is an abundant number, since it is smaller than the sum of its proper divisors (35161089956).

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

21143398284 is a wasteful number, since it uses less digits than its factorization.

21143398284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25159 (or 25154 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The spelling of 21143398284 in words is "twenty-one billion, one hundred forty-three million, three hundred ninety-eight thousand, two hundred eighty-four".