21111011012 has 48 divisors (see below), whose sum is σ = 47446839552. Its totient is φ = 7988492160.

The previous prime is 21111010981. The next prime is 21111011021. The reversal of 21111011012 is 21011011112.

It is a junction number, because it is equal to n+sod(n) for n = 21111010984 and 21111011002.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1252439 + ... + 1269182.

It is an arithmetic number, because the mean of its divisors is an integer number (988475824).

Almost surely, 2^21111011012 is an apocalyptic number.

It is an amenable number.

21111011012 is an abundant number, since it is smaller than the sum of its proper divisors (26335828540).

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

21111011012 is a wasteful number, since it uses less digits than its factorization.

21111011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2521668 (or 2521666 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111011012 its reverse (21011011112), we get a palindrome (42122022124).

The spelling of 21111011012 in words is "twenty-one billion, one hundred eleven million, eleven thousand, twelve".