21021311300 has 72 divisors (see below), whose sum is σ = 50068899552. Its totient is φ = 7597152000.

The previous prime is 21021311281. The next prime is 21021311309. The reversal of 21021311300 is 311312012.

It is not an unprimeable number, because it can be changed into a prime (21021311309) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 120680 + ... + 237920.

Almost surely, 2^21021311300 is an apocalyptic number.

21021311300 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 21021311300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25034449776).

21021311300 is an abundant number, since it is smaller than the sum of its proper divisors (29047588252).

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

21021311300 is a wasteful number, since it uses less digits than its factorization.

21021311300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117429 (or 117422 counting only the distinct ones).

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

Adding to 21021311300 its reverse (311312012), we get a palindrome (21332623312).

The spelling of 21021311300 in words is "twenty-one billion, twenty-one million, three hundred eleven thousand, three hundred".