21211311000 has 256 divisors, whose sum is σ = 72392486400. Its totient is φ = 5128128000.

The previous prime is 21211310951. The next prime is 21211311013. The reversal of 21211311000 is 11311212.

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

It is a congruent number.

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, 17258386 + ... + 17259614.

It is an arithmetic number, because the mean of its divisors is an integer number (282783150).

Almost surely, 2^21211311000 is an apocalyptic number.

21211311000 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 21211311000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36196243200).

21211311000 is an abundant number, since it is smaller than the sum of its proper divisors (51181175400).

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

21211311000 is a wasteful number, since it uses less digits than its factorization.

21211311000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1773 counting only the distinct ones).

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

Adding to 21211311000 its reverse (11311212), we get a palindrome (21222622212).

The spelling of 21211311000 in words is "twenty-one billion, two hundred eleven million, three hundred eleven thousand".