21112201102111 has 4 divisors (see below), whose sum is σ = 24128229830992. Its totient is φ = 18096172373232.

The previous prime is 21112201102103. The next prime is 21112201102147. The reversal of 21112201102111 is 11120110221112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21112201102111 - 2³ = 21112201102103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112201502111) 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, 1508014364430 + ... + 1508014364443.

It is an arithmetic number, because the mean of its divisors is an integer number (6032057457748).

Almost surely, 2^{21112201102111} is an apocalyptic number.

21112201102111 is a deficient number, since it is larger than the sum of its proper divisors (3016028728881).

21112201102111 is an equidigital number, since it uses as much as digits as its factorization.

21112201102111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3016028728880.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 21112201102111 its reverse (11120110221112), we get a palindrome (32232311323223).

The spelling of 21112201102111 in words is "twenty-one trillion, one hundred twelve billion, two hundred one million, one hundred two thousand, one hundred eleven".