21211231112 has 8 divisors (see below), whose sum is σ = 39771058350. Its totient is φ = 10605615552.

The previous prime is 21211231081. The next prime is 21211231121. The reversal of 21211231112 is 21113211212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17002595236 + 4208635876 = 130394^2 + 64874^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1325701937 + ... + 1325701952.

Almost surely, 2^21211231112 is an apocalyptic number.

It is an amenable number.

21211231112 is a deficient number, since it is larger than the sum of its proper divisors (18559827238).

21211231112 is a wasteful number, since it uses less digits than its factorization.

21211231112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651403895 (or 2651403891 counting only the distinct ones).

The product of its digits is 48, while the sum is 17.

Adding to 21211231112 its reverse (21113211212), we get a palindrome (42324442324).

The spelling of 21211231112 in words is "twenty-one billion, two hundred eleven million, two hundred thirty-one thousand, one hundred twelve".