21110111004 has 24 divisors (see below), whose sum is σ = 49283276560. Its totient is φ = 7032939264.

The previous prime is 21110111003. The next prime is 21110111041. The reversal of 21110111004 is 40011101112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110111003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447139 + ... + 492090.

Almost surely, 2^21110111004 is an apocalyptic number.

It is an amenable number.

21110111004 is an abundant number, since it is smaller than the sum of its proper divisors (28173165556).

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

21110111004 is a wasteful number, since it uses less digits than its factorization.

21110111004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 941109 (or 941107 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21110111004 its reverse (40011101112), we get a palindrome (61121212116).

The spelling of 21110111004 in words is "twenty-one billion, one hundred ten million, one hundred eleven thousand, four".