21011343100 has 144 divisors (see below), whose sum is σ = 50465520000. Its totient is φ = 7529760000.

The previous prime is 21011343083. The next prime is 21011343109. The reversal of 21011343100 is 134311012.

It is a super-2 number, since 2×21011343100² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011343109) 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, 42106651 + ... + 42107149.

It is an arithmetic number, because the mean of its divisors is an integer number (350455000).

Almost surely, 2^21011343100 is an apocalyptic number.

21011343100 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 21011343100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25232760000).

21011343100 is an abundant number, since it is smaller than the sum of its proper divisors (29454176900).

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

21011343100 is a wasteful number, since it uses less digits than its factorization.

21011343100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1004 (or 997 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21011343100 its reverse (134311012), we get a palindrome (21145654112).

The spelling of 21011343100 in words is "twenty-one billion, eleven million, three hundred forty-three thousand, one hundred".