21112111111010 has 16 divisors (see below), whose sum is σ = 38459653013376. Its totient is φ = 8343099330288.

The previous prime is 21112111110997. The next prime is 21112111111019. The reversal of 21112111111010 is 1011111121112.

It is not an unprimeable number, because it can be changed into a prime (21112111111019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12718138394 + ... + 12718140053.

It is an arithmetic number, because the mean of its divisors is an integer number (2403728313336).

Almost surely, 2^{21112111111010} is an apocalyptic number.

21112111111010 is a deficient number, since it is larger than the sum of its proper divisors (17347541902366).

21112111111010 is a wasteful number, since it uses less digits than its factorization.

21112111111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25436278537.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 21112111111010 its reverse (1011111121112), we get a palindrome (22123222232122).

The spelling of 21112111111010 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, one hundred eleven thousand, ten".