21011022312 has 64 divisors (see below), whose sum is σ = 60121015680. Its totient is φ = 5994196992.

The previous prime is 21011022289. The next prime is 21011022323. The reversal of 21011022312 is 21322011012.

It is a junction number, because it is equal to n+sod(n) for n = 21011022291 and 21011022300.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20148 + ... + 205980.

It is an arithmetic number, because the mean of its divisors is an integer number (939390870).

Almost surely, 2^21011022312 is an apocalyptic number.

It is an amenable number.

21011022312 is an abundant number, since it is smaller than the sum of its proper divisors (39109993368).

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

21011022312 is a wasteful number, since it uses less digits than its factorization.

21011022312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186522 (or 186518 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21011022312 its reverse (21322011012), we get a palindrome (42333033324).

The spelling of 21011022312 in words is "twenty-one billion, eleven million, twenty-two thousand, three hundred twelve".