22021303212 has 18 divisors (see below), whose sum is σ = 55664960988. Its totient is φ = 7340434392.

The previous prime is 22021303177. The next prime is 22021303219. The reversal of 22021303212 is 21230312022.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is not an unprimeable number, because it can be changed into a prime (22021303219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 305851398 + ... + 305851469.

Almost surely, 2^22021303212 is an apocalyptic number.

It is an amenable number.

22021303212 is an abundant number, since it is smaller than the sum of its proper divisors (33643657776).

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

22021303212 is a wasteful number, since it uses less digits than its factorization.

22021303212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611702877 (or 611702872 counting only the distinct ones).

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

Adding to 22021303212 its reverse (21230312022), we get a palindrome (43251615234).

The spelling of 22021303212 in words is "twenty-two billion, twenty-one million, three hundred three thousand, two hundred twelve".