21220000032 has 192 divisors, whose sum is σ = 73532841984. Its totient is φ = 5187440640.

The previous prime is 21220000019. The next prime is 21220000037. The reversal of 21220000032 is 23000002212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21219999972 and 21220000017.

It is not an unprimeable number, because it can be changed into a prime (21220000037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41233 + ... + 210095.

It is an arithmetic number, because the mean of its divisors is an integer number (382983552).

Almost surely, 2^21220000032 is an apocalyptic number.

21220000032 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 21220000032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36766420992).

21220000032 is an abundant number, since it is smaller than the sum of its proper divisors (52312841952).

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

21220000032 is a wasteful number, since it uses less digits than its factorization.

21220000032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168911 (or 168903 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 21220000032 its reverse (23000002212), we get a palindrome (44220002244).

The spelling of 21220000032 in words is "twenty-one billion, two hundred twenty million, thirty-two", and thus it is an aban number.