21212220032 has 32 divisors (see below), whose sum is σ = 42951501300. Its totient is φ = 10432235520.

The previous prime is 21212220031. The next prime is 21212220047. The reversal of 21212220032 is 23002221212.

It can be written as a sum of positive squares in 2 ways, for example, as 19885512256 + 1326707776 = 141016^2 + 36424^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21212220031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350557 + ... + 1366172.

Almost surely, 2^21212220032 is an apocalyptic number.

It is an amenable number.

21212220032 is an abundant number, since it is smaller than the sum of its proper divisors (21739281268).

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

21212220032 is an equidigital number, since it uses as much as digits as its factorization.

21212220032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716804 (or 2716792 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21212220032 its reverse (23002221212), we get a palindrome (44214441244).

The spelling of 21212220032 in words is "twenty-one billion, two hundred twelve million, two hundred twenty thousand, thirty-two".