21010144000 has 144 divisors (see below), whose sum is σ = 53559586080. Its totient is φ = 8208076800.

The previous prime is 21010143953. The next prime is 21010144019. The reversal of 21010144000 is 44101012.

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, 1368366 + ... + 1383634.

It is an arithmetic number, because the mean of its divisors is an integer number (371941570).

Almost surely, 2^21010144000 is an apocalyptic number.

21010144000 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 21010144000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26779793040).

21010144000 is an abundant number, since it is smaller than the sum of its proper divisors (32549442080).

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

21010144000 is an equidigital number, since it uses as much as digits as its factorization.

21010144000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15343 (or 15319 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21010144000 its reverse (44101012), we get a palindrome (21054245012).

The spelling of 21010144000 in words is "twenty-one billion, ten million, one hundred forty-four thousand".