21100222120111 has 4 divisors (see below), whose sum is σ = 21210694487424. Its totient is φ = 20989749752800.

The previous prime is 21100222120079. The next prime is 21100222120139. The reversal of 21100222120111 is 11102122200112.

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 21100222120111 - 2⁵ = 21100222120079 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 (21100222120151) 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, 55236183370 + ... + 55236183751.

It is an arithmetic number, because the mean of its divisors is an integer number (5302673621856).

Almost surely, 2^{21100222120111} is an apocalyptic number.

21100222120111 is a deficient number, since it is larger than the sum of its proper divisors (110472367313).

21100222120111 is a wasteful number, since it uses less digits than its factorization.

21100222120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110472367312.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21100222120111 its reverse (11102122200112), we get a palindrome (32202344320223).

The spelling of 21100222120111 in words is "twenty-one trillion, one hundred billion, two hundred twenty-two million, one hundred twenty thousand, one hundred eleven".