21032311104 has 168 divisors, whose sum is σ = 69581011968. Its totient is φ = 5949619200.

The previous prime is 21032311081. The next prime is 21032311109. The reversal of 21032311104 is 40111323012.

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×21032311104² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032311109) 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, 381409 + ... + 433055.

Almost surely, 2^21032311104 is an apocalyptic number.

21032311104 is a gapful number since it is divisible by the number (24) 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 21032311104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34790505984).

21032311104 is an abundant number, since it is smaller than the sum of its proper divisors (48548700864).

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

21032311104 is a wasteful number, since it uses less digits than its factorization.

21032311104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51773 (or 51760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21032311104 its reverse (40111323012), we get a palindrome (61143634116).

The spelling of 21032311104 in words is "twenty-one billion, thirty-two million, three hundred eleven thousand, one hundred four".