21002112300 has 144 divisors (see below), whose sum is σ = 65680053152. Its totient is φ = 5150822400.

The previous prime is 21002112277. The next prime is 21002112343. The reversal of 21002112300 is 321120012.

It is a super-2 number, since 2×21002112300² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1070580 + ... + 1090020.

Almost surely, 2^21002112300 is an apocalyptic number.

21002112300 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 21002112300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32840026576).

21002112300 is an abundant number, since it is smaller than the sum of its proper divisors (44677940852).

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

21002112300 is a wasteful number, since it uses less digits than its factorization.

21002112300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19748 (or 19741 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21002112300 its reverse (321120012), we get a palindrome (21323232312).

The spelling of 21002112300 in words is "twenty-one billion, two million, one hundred twelve thousand, three hundred".