22021320312 has 40 divisors (see below), whose sum is σ = 61680088800. Its totient is φ = 7340439888.

The previous prime is 22021320257. The next prime is 22021320313. The reversal of 22021320312 is 21302312022.

22021320312 is a `hidden beast` number, since 220 + 2 + 132 + 0 + 312 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021320313) 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, 16991112 + ... + 16992407.

It is an arithmetic number, because the mean of its divisors is an integer number (1542002220).

Almost surely, 2^22021320312 is an apocalyptic number.

It is an amenable number.

22021320312 is an abundant number, since it is smaller than the sum of its proper divisors (39658768488).

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

22021320312 is a wasteful number, since it uses less digits than its factorization.

22021320312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33983537 (or 33983524 counting only the distinct ones).

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

Adding to 22021320312 its reverse (21302312022), we get a palindrome (43323632334).

The spelling of 22021320312 in words is "twenty-two billion, twenty-one million, three hundred twenty thousand, three hundred twelve".