21021111112 has 16 divisors (see below), whose sum is σ = 39417177600. Its totient is φ = 10509863760.

The previous prime is 21021111049. The next prime is 21021111131. The reversal of 21021111112 is 21111112012.

It is a happy number.

It is a super-2 number, since 2×21021111112² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21021111092 and 21021111101.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56589 + ... + 212707.

It is an arithmetic number, because the mean of its divisors is an integer number (2463573600).

Almost surely, 2^21021111112 is an apocalyptic number.

It is an amenable number.

21021111112 is a deficient number, since it is larger than the sum of its proper divisors (18396066488).

21021111112 is a wasteful number, since it uses less digits than its factorization.

21021111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172956 (or 172952 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21021111112 its reverse (21111112012), we get a palindrome (42132223124).

The spelling of 21021111112 in words is "twenty-one billion, twenty-one million, one hundred eleven thousand, one hundred twelve".