21152425440000 has 360 divisors, whose sum is σ = 74485993039920. Its totient is φ = 5308841984000.

The previous prime is 21152425439993. The next prime is 21152425440071. The reversal of 21152425440000 is 4452425112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 21152425440000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6863896 + ... + 9456104.

It is an arithmetic number, because the mean of its divisors is an integer number (206905536222).

Almost surely, 2^{21152425440000} is an apocalyptic number.

21152425440000 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 21152425440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37242996519960).

21152425440000 is an abundant number, since it is smaller than the sum of its proper divisors (53333567599920).

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

21152425440000 is an equidigital number, since it uses as much as digits as its factorization.

21152425440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592265 (or 2592236 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 30.

Adding to 21152425440000 its reverse (4452425112), we get a palindrome (21156877865112).

The spelling of 21152425440000 in words is "twenty-one trillion, one hundred fifty-two billion, four hundred twenty-five million, four hundred forty thousand".