21111230312 has 32 divisors (see below), whose sum is σ = 40262702400. Its totient is φ = 10375411200.

The previous prime is 21111230291. The next prime is 21111230339. The reversal of 21111230312 is 21303211112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131864 + ... + 244152.

It is an arithmetic number, because the mean of its divisors is an integer number (1258209450).

Almost surely, 2^21111230312 is an apocalyptic number.

It is an amenable number.

21111230312 is a deficient number, since it is larger than the sum of its proper divisors (19151472088).

21111230312 is a wasteful number, since it uses less digits than its factorization.

21111230312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112697 (or 112693 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21111230312 its reverse (21303211112), we get a palindrome (42414441424).

The spelling of 21111230312 in words is "twenty-one billion, one hundred eleven million, two hundred thirty thousand, three hundred twelve".