21293280000 has 900 divisors, whose sum is σ = 83445139008. Its totient is φ = 5391360000.

The previous prime is 21293279999. The next prime is 21293280023. The reversal of 21293280000 is 8239212.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (900).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 401759974 + ... + 401760026.

Almost surely, 2^21293280000 is an apocalyptic number.

21293280000 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 21293280000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41722569504).

21293280000 is an abundant number, since it is smaller than the sum of its proper divisors (62151859008).

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

21293280000 is an frugal number, since it uses more digits than its factorization.

21293280000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 21293280000 in words is "twenty-one billion, two hundred ninety-three million, two hundred eighty thousand".