21111102212 has 24 divisors (see below), whose sum is σ = 38134448352. Its totient is φ = 10219476800.

The previous prime is 21111102209. The next prime is 21111102241. The reversal of 21111102212 is 21220111112.

It is a super-2 number, since 2×21111102212² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469838 + ... + 512805.

It is an arithmetic number, because the mean of its divisors is an integer number (1588935348).

Almost surely, 2^21111102212 is an apocalyptic number.

It is an amenable number.

21111102212 is a deficient number, since it is larger than the sum of its proper divisors (17023346140).

21111102212 is a wasteful number, since it uses less digits than its factorization.

21111102212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982819 (or 982817 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21111102212 its reverse (21220111112), we get a palindrome (42331213324).

The spelling of 21111102212 in words is "twenty-one billion, one hundred eleven million, one hundred two thousand, two hundred twelve".