21284469120 has 128 divisors (see below), whose sum is σ = 68141916000. Its totient is φ = 5650956288.

The previous prime is 21284469109. The next prime is 21284469133. The reversal of 21284469120 is 2196448212.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

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, 415476 + ... + 463884.

Almost surely, 2^21284469120 is an apocalyptic number.

21284469120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21284469120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34070958000).

21284469120 is an abundant number, since it is smaller than the sum of its proper divisors (46857446880).

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

21284469120 is a wasteful number, since it uses less digits than its factorization.

21284469120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48660 (or 48648 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 21284469120 in words is "twenty-one billion, two hundred eighty-four million, four hundred sixty-nine thousand, one hundred twenty".