21145425000 has 192 divisors, whose sum is σ = 75516416640. Its totient is φ = 4833120000.

The previous prime is 21145424987. The next prime is 21145425011. The reversal of 21145425000 is 52454112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 504862 + ... + 545138.

It is an arithmetic number, because the mean of its divisors is an integer number (393314670).

Almost surely, 2^21145425000 is an apocalyptic number.

21145425000 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 21145425000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37758208320).

21145425000 is an abundant number, since it is smaller than the sum of its proper divisors (54370991640).

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

21145425000 is an equidigital number, since it uses as much as digits as its factorization.

21145425000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40318 (or 40294 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

Adding to 21145425000 its reverse (52454112), we get a palindrome (21197879112).

The spelling of 21145425000 in words is "twenty-one billion, one hundred forty-five million, four hundred twenty-five thousand".