21303022212 has 72 divisors (see below), whose sum is σ = 54486973632. Its totient is φ = 7017192000.

The previous prime is 21303022199. The next prime is 21303022229. The reversal of 21303022212 is 21222030312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1983537 + ... + 1994247.

Almost surely, 2^21303022212 is an apocalyptic number.

It is an amenable number.

21303022212 is an abundant number, since it is smaller than the sum of its proper divisors (33183951420).

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

21303022212 is a wasteful number, since it uses less digits than its factorization.

21303022212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11369 (or 11364 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21303022212 its reverse (21222030312), we get a palindrome (42525052524).

The spelling of 21303022212 in words is "twenty-one billion, three hundred three million, twenty-two thousand, two hundred twelve".