21111010312 has 32 divisors (see below), whose sum is σ = 47898933120. Its totient is φ = 8515365120.

The previous prime is 21111010309. The next prime is 21111010337. The reversal of 21111010312 is 21301011112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21111010292 and 21111010301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11086764 + ... + 11088667.

It is an arithmetic number, because the mean of its divisors is an integer number (1496841660).

Almost surely, 2^21111010312 is an apocalyptic number.

It is an amenable number.

21111010312 is an abundant number, since it is smaller than the sum of its proper divisors (26787922808).

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

21111010312 is a wasteful number, since it uses less digits than its factorization.

21111010312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22175461 (or 22175457 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21111010312 its reverse (21301011112), we get a palindrome (42412021424).

The spelling of 21111010312 in words is "twenty-one billion, one hundred eleven million, ten thousand, three hundred twelve".