21111210999998 has 32 divisors (see below), whose sum is σ = 36537125289984. Its totient is φ = 8961282675072.

The previous prime is 21111210999821. The next prime is 21111211000039. The reversal of 21111210999998 is 89999901211112.

It is a self number, because there is not a number n which added to its sum of digits gives 21111210999998.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8957090 + ... + 11065797.

It is an arithmetic number, because the mean of its divisors is an integer number (1141785165312).

Almost surely, 2^{21111210999998} is an apocalyptic number.

21111210999998 is a deficient number, since it is larger than the sum of its proper divisors (15425914289986).

21111210999998 is a wasteful number, since it uses less digits than its factorization.

21111210999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20023616.

The product of its (nonzero) digits is 1889568, while the sum is 62.

The spelling of 21111210999998 in words is "twenty-one trillion, one hundred eleven billion, two hundred ten million, nine hundred ninety-nine thousand, nine hundred ninety-eight".