21211022312 has 8 divisors (see below), whose sum is σ = 39770666850. Its totient is φ = 10605511152.

The previous prime is 21211022311. The next prime is 21211022317. The reversal of 21211022312 is 21322011212.

It can be written as a sum of positive squares in only one way, i.e., 20131636996 + 1079385316 = 141886^2 + 32854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21211022311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325688887 + ... + 1325688902.

Almost surely, 2^21211022312 is an apocalyptic number.

It is an amenable number.

21211022312 is a deficient number, since it is larger than the sum of its proper divisors (18559644538).

21211022312 is a wasteful number, since it uses less digits than its factorization.

21211022312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651377795 (or 2651377791 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21211022312 its reverse (21322011212), we get a palindrome (42533033524).

The spelling of 21211022312 in words is "twenty-one billion, two hundred eleven million, twenty-two thousand, three hundred twelve".