21315144300 has 288 divisors, whose sum is σ = 67995648000. Its totient is φ = 5134752000.

The previous prime is 21315144293. The next prime is 21315144337. The reversal of 21315144300 is 344151312.

It is a happy number.

It is a super-3 number, since 3×21315144300³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12544851 + ... + 12546549.

It is an arithmetic number, because the mean of its divisors is an integer number (236096000).

Almost surely, 2^21315144300 is an apocalyptic number.

21315144300 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 21315144300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33997824000).

21315144300 is an abundant number, since it is smaller than the sum of its proper divisors (46680503700).

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

21315144300 is a wasteful number, since it uses less digits than its factorization.

21315144300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21315144300 its reverse (344151312), we get a palindrome (21659295612).

The spelling of 21315144300 in words is "twenty-one billion, three hundred fifteen million, one hundred forty-four thousand, three hundred".