21111100112 has 20 divisors (see below), whose sum is σ = 40950399840. Its totient is φ = 10543255008.

The previous prime is 21111100103. The next prime is 21111100117. The reversal of 21111100112 is 21100111112.

It is a junction number, because it is equal to n+sod(n) for n = 21111100093 and 21111100102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111100117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754268 + ... + 781755.

It is an arithmetic number, because the mean of its divisors is an integer number (2047519992).

Almost surely, 2^21111100112 is an apocalyptic number.

It is an amenable number.

21111100112 is a deficient number, since it is larger than the sum of its proper divisors (19839299728).

21111100112 is a wasteful number, since it uses less digits than its factorization.

21111100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536890 (or 1536884 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21111100112 its reverse (21100111112), we get a palindrome (42211211224).

The spelling of 21111100112 in words is "twenty-one billion, one hundred eleven million, one hundred thousand, one hundred twelve".