21101120220111 has 16 divisors (see below), whose sum is σ = 28194998352384. Its totient is φ = 14037332703264.

The previous prime is 21101120220109. The next prime is 21101120220127. The reversal of 21101120220111 is 11102202110112.

It is a happy number.

It is not a de Polignac number, because 21101120220111 - 2¹ = 21101120220109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101120020111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16723105 + ... + 17940581.

It is an arithmetic number, because the mean of its divisors is an integer number (1762187397024).

Almost surely, 2^{21101120220111} is an apocalyptic number.

21101120220111 is a deficient number, since it is larger than the sum of its proper divisors (7093878132273).

21101120220111 is a wasteful number, since it uses less digits than its factorization.

21101120220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229830.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21101120220111 its reverse (11102202110112), we get a palindrome (32203322330223).

The spelling of 21101120220111 in words is "twenty-one trillion, one hundred one billion, one hundred twenty million, two hundred twenty thousand, one hundred eleven".