21100122112011 has 8 divisors (see below), whose sum is σ = 28133596178640. Its totient is φ = 14066698060032.

The previous prime is 21100122111989. The next prime is 21100122112057. The reversal of 21100122112011 is 11021122100112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-21100122112011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21100122112411) 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, 11507950 + ... + 13214883.

It is an arithmetic number, because the mean of its divisors is an integer number (3516699522330).

Almost surely, 2^{21100122112011} is an apocalyptic number.

21100122112011 is a deficient number, since it is larger than the sum of its proper divisors (7033474066629).

21100122112011 is a wasteful number, since it uses less digits than its factorization.

21100122112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25007325.

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

Adding to 21100122112011 its reverse (11021122100112), we get a palindrome (32121244212123).

The spelling of 21100122112011 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, one hundred twelve thousand, eleven".