21220313000 has 32 divisors (see below), whose sum is σ = 49655534760. Its totient is φ = 8488124800.

The previous prime is 21220312991. The next prime is 21220313021. The reversal of 21220313000 is 31302212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12511317316 + 8708995684 = 111854^2 + 93322^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10609157 + ... + 10611156.

Almost surely, 2^21220313000 is an apocalyptic number.

21220313000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220313000 is an abundant number, since it is smaller than the sum of its proper divisors (28435221760).

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

21220313000 is a wasteful number, since it uses less digits than its factorization.

21220313000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21220334 (or 21220320 counting only the distinct ones).

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

Adding to 21220313000 its reverse (31302212), we get a palindrome (21251615212).

The spelling of 21220313000 in words is "twenty-one billion, two hundred twenty million, three hundred thirteen thousand".