21010243200 has 192 divisors, whose sum is σ = 69296368320. Its totient is φ = 5595136000.

The previous prime is 21010243157. The next prime is 21010243213. The reversal of 21010243200 is 234201012.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21010243200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13122400 + ... + 13124000.

It is an arithmetic number, because the mean of its divisors is an integer number (360918585).

Almost surely, 2^21010243200 is an apocalyptic number.

21010243200 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 21010243200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34648184160).

21010243200 is an abundant number, since it is smaller than the sum of its proper divisors (48286125120).

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

21010243200 is a wasteful number, since it uses less digits than its factorization.

21010243200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995 (or 2978 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21010243200 its reverse (234201012), we get a palindrome (21244444212).

The spelling of 21010243200 in words is "twenty-one billion, ten million, two hundred forty-three thousand, two hundred".