21110111016 has 16 divisors (see below), whose sum is σ = 52775277600. Its totient is φ = 7036703664.

The previous prime is 21110111003. The next prime is 21110111041. The reversal of 21110111016 is 61011101112.

It is a junction number, because it is equal to n+sod(n) for n = 21110110986 and 21110111004.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439793956 + ... + 439794003.

It is an arithmetic number, because the mean of its divisors is an integer number (3298454850).

Almost surely, 2^21110111016 is an apocalyptic number.

It is an amenable number.

21110111016 is an abundant number, since it is smaller than the sum of its proper divisors (31665166584).

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

21110111016 is a wasteful number, since it uses less digits than its factorization.

21110111016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879587968 (or 879587964 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 21110111016 its reverse (61011101112), we get a palindrome (82121212128).

The spelling of 21110111016 in words is "twenty-one billion, one hundred ten million, one hundred eleven thousand, sixteen".