21111234104 has 8 divisors (see below), whose sum is σ = 39583563960. Its totient is φ = 10555617048.

The previous prime is 21111234091. The next prime is 21111234173. The reversal of 21111234104 is 40143211112.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1319452124 + ... + 1319452139.

It is an arithmetic number, because the mean of its divisors is an integer number (4947945495).

Almost surely, 2^21111234104 is an apocalyptic number.

It is an amenable number.

21111234104 is a deficient number, since it is larger than the sum of its proper divisors (18472329856).

21111234104 is a wasteful number, since it uses less digits than its factorization.

21111234104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638904269 (or 2638904265 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21111234104 its reverse (40143211112), we get a palindrome (61254445216).

The spelling of 21111234104 in words is "twenty-one billion, one hundred eleven million, two hundred thirty-four thousand, one hundred four".