21331220000 has 60 divisors (see below), whose sum is σ = 52478050086. Its totient is φ = 8532480000.

The previous prime is 21331219993. The next prime is 21331220003. The reversal of 21331220000 is 2213312.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 3927278224 + 17403941776 = 62668^2 + 131924^2 .

It is not an unprimeable number, because it can be changed into a prime (21331220003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 513281 + ... + 553280.

Almost surely, 2^21331220000 is an apocalyptic number.

21331220000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21331220000 is an abundant number, since it is smaller than the sum of its proper divisors (31146830086).

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

21331220000 is an equidigital number, since it uses as much as digits as its factorization.

21331220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066591 (or 1066568 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21331220000 its reverse (2213312), we get a palindrome (21333433312).

The spelling of 21331220000 in words is "twenty-one billion, three hundred thirty-one million, two hundred twenty thousand".