21211002312 has 16 divisors (see below), whose sum is σ = 53027505840. Its totient is φ = 7070334096.

The previous prime is 21211002271. The next prime is 21211002313. The reversal of 21211002312 is 21320011212.

It is a junction number, because it is equal to n+sod(n) for n = 21211002291 and 21211002300.

It is not an unprimeable number, because it can be changed into a prime (21211002313) 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, 441895858 + ... + 441895905.

It is an arithmetic number, because the mean of its divisors is an integer number (3314219115).

Almost surely, 2^21211002312 is an apocalyptic number.

It is an amenable number.

21211002312 is an abundant number, since it is smaller than the sum of its proper divisors (31816503528).

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

21211002312 is a wasteful number, since it uses less digits than its factorization.

21211002312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883791772 (or 883791768 counting only the distinct ones).

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

Adding to 21211002312 its reverse (21320011212), we get a palindrome (42531013524).

The spelling of 21211002312 in words is "twenty-one billion, two hundred eleven million, two thousand, three hundred twelve".