21111303132 has 60 divisors (see below), whose sum is σ = 55356132216. Its totient is φ = 7015805280.

The previous prime is 21111303131. The next prime is 21111303133. The reversal of 21111303132 is 23130311112.

It is an interprime number because it is at equal distance from previous prime (21111303131) and next prime (21111303133).

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 (21111303131) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8818 + ... + 205670.

Almost surely, 2^21111303132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111303132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27678066108).

21111303132 is an abundant number, since it is smaller than the sum of its proper divisors (34244829084).

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

21111303132 is a wasteful number, since it uses less digits than its factorization.

21111303132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197200 (or 197189 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21111303132 its reverse (23130311112), we get a palindrome (44241614244).

The spelling of 21111303132 in words is "twenty-one billion, one hundred eleven million, three hundred three thousand, one hundred thirty-two".