21510445000 has 160 divisors (see below), whose sum is σ = 56327594400. Its totient is φ = 7630400000.

The previous prime is 21510444983. The next prime is 21510445027. The reversal of 21510445000 is 54401512.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 2250231 + ... + 2259769.

It is an arithmetic number, because the mean of its divisors is an integer number (352047465).

Almost surely, 2^21510445000 is an apocalyptic number.

21510445000 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 21510445000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28163797200).

21510445000 is an abundant number, since it is smaller than the sum of its proper divisors (34817149400).

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

21510445000 is a wasteful number, since it uses less digits than its factorization.

21510445000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9617 (or 9598 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 21510445000 its reverse (54401512), we get a palindrome (21564846512).

The spelling of 21510445000 in words is "twenty-one billion, five hundred ten million, four hundred forty-five thousand".