21101301320 has 256 divisors, whose sum is σ = 55022976000. Its totient is φ = 7272545280.

The previous prime is 21101301313. The next prime is 21101301343. The reversal of 21101301320 is 2310310112.

It is a junction number, because it is equal to n+sod(n) for n = 21101301295 and 21101301304.

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 63 ways as a sum of consecutive naturals, for example, 121972754 + ... + 121972926.

It is an arithmetic number, because the mean of its divisors is an integer number (214933500).

Almost surely, 2^21101301320 is an apocalyptic number.

21101301320 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 21101301320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27511488000).

21101301320 is an abundant number, since it is smaller than the sum of its proper divisors (33921674680).

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

21101301320 is a wasteful number, since it uses less digits than its factorization.

21101301320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 299 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21101301320 its reverse (2310310112), we get a palindrome (23411611432).

The spelling of 21101301320 in words is "twenty-one billion, one hundred one million, three hundred one thousand, three hundred twenty".