21122203312 has 20 divisors (see below), whose sum is σ = 46770593296. Its totient is φ = 9052372800.

The previous prime is 21122203279. The next prime is 21122203313. The reversal of 21122203312 is 21330222112.

It is a super-2 number, since 2×21122203312² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21122203312.

It is not an unprimeable number, because it can be changed into a prime (21122203313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94295439 + ... + 94295662.

Almost surely, 2^21122203312 is an apocalyptic number.

It is an amenable number.

21122203312 is an abundant number, since it is smaller than the sum of its proper divisors (25648389984).

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

21122203312 is a wasteful number, since it uses less digits than its factorization.

21122203312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188591116 (or 188591110 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21122203312 its reverse (21330222112), we get a palindrome (42452425424).

The spelling of 21122203312 in words is "twenty-one billion, one hundred twenty-two million, two hundred three thousand, three hundred twelve".