21100122120001 has 16 divisors (see below), whose sum is σ = 21304094663808. Its totient is φ = 20897142739200.

The previous prime is 21100122119981. The next prime is 21100122120013. The reversal of 21100122120001 is 10002122100112.

It is a cyclic number.

It is not a de Polignac number, because 21100122120001 - 2¹⁷ = 21100121988929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100122160001) 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, 58567146 + ... + 58926316.

It is an arithmetic number, because the mean of its divisors is an integer number (1331505916488).

Almost surely, 2^{21100122120001} is an apocalyptic number.

It is an amenable number.

21100122120001 is a deficient number, since it is larger than the sum of its proper divisors (203972543807).

21100122120001 is a wasteful number, since it uses less digits than its factorization.

21100122120001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360552.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100122120001 its reverse (10002122100112), we get a palindrome (31102244220113).

The spelling of 21100122120001 in words is "twenty-one trillion, one hundred billion, one hundred twenty-two million, one hundred twenty thousand, one".