21111010022111 has 4 divisors (see below), whose sum is σ = 21348212382000. Its totient is φ = 20873807662224.

The previous prime is 21111010022107. The next prime is 21111010022261. The reversal of 21111010022111 is 11122001011112.

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 21111010022111 - 2² = 21111010022107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111010022101) 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, 118601179811 + ... + 118601179988.

It is an arithmetic number, because the mean of its divisors is an integer number (5337053095500).

Almost surely, 2^{21111010022111} is an apocalyptic number.

21111010022111 is a deficient number, since it is larger than the sum of its proper divisors (237202359889).

21111010022111 is an equidigital number, since it uses as much as digits as its factorization.

21111010022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237202359888.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21111010022111 its reverse (11122001011112), we get a palindrome (32233011033223).

The spelling of 21111010022111 in words is "twenty-one trillion, one hundred eleven billion, ten million, twenty-two thousand, one hundred eleven".