21111001312 has 12 divisors (see below), whose sum is σ = 41562283896. Its totient is φ = 10555500640.

The previous prime is 21111001291. The next prime is 21111001343. The reversal of 21111001312 is 21310011112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21111001292 and 21111001301.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 329859364 + ... + 329859427.

It is an arithmetic number, because the mean of its divisors is an integer number (3463523658).

Almost surely, 2^21111001312 is an apocalyptic number.

It is an amenable number.

21111001312 is a deficient number, since it is larger than the sum of its proper divisors (20451282584).

21111001312 is an equidigital number, since it uses as much as digits as its factorization.

21111001312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659718801 (or 659718793 counting only the distinct ones).

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

Adding to 21111001312 its reverse (21310011112), we get a palindrome (42421012424).

The spelling of 21111001312 in words is "twenty-one billion, one hundred eleven million, one thousand, three hundred twelve".