21103391232 has 360 divisors, whose sum is σ = 76523935488. Its totient is φ = 5480386560.

The previous prime is 21103391203. The next prime is 21103391233. The reversal of 21103391232 is 23219330112.

It is a junction number, because it is equal to n+sod(n) for n = 21103391196 and 21103391205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103391233) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3900273 + ... + 3905679.

Almost surely, 2^21103391232 is an apocalyptic number.

21103391232 is a gapful number since it is divisible by the number (22) 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 21103391232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38261967744).

21103391232 is an abundant number, since it is smaller than the sum of its proper divisors (55420544256).

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

21103391232 is a wasteful number, since it uses less digits than its factorization.

21103391232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5460 (or 5430 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The spelling of 21103391232 in words is "twenty-one billion, one hundred three million, three hundred ninety-one thousand, two hundred thirty-two".