21216106512300 has 144 divisors (see below), whose sum is σ = 70198532284160. Its totient is φ = 4846358442240.

The previous prime is 21216106512287. The next prime is 21216106512301. The reversal of 21216106512300 is 321560161212.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21216106512301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 190611 + ... + 6516789.

Almost surely, 2^{21216106512300} is an apocalyptic number.

21216106512300 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 21216106512300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35099266142080).

21216106512300 is an abundant number, since it is smaller than the sum of its proper divisors (48982425771860).

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

21216106512300 is a wasteful number, since it uses less digits than its factorization.

21216106512300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6327800 (or 6327793 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 21216106512300 its reverse (321560161212), we get a palindrome (21537666673512).

The spelling of 21216106512300 in words is "twenty-one trillion, two hundred sixteen billion, one hundred six million, five hundred twelve thousand, three hundred".