21101010122001 has 12 divisors (see below), whose sum is σ = 29071526956656. Its totient is φ = 13613554915560.

The previous prime is 21101010121991. The next prime is 21101010122021. The reversal of 21101010122001 is 10022101010112.

It is not a de Polignac number, because 21101010122001 - 2¹³ = 21101010113809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101010122021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3659554891 + ... + 3659560656.

It is an arithmetic number, because the mean of its divisors is an integer number (2422627246388).

Almost surely, 2^{21101010122001} is an apocalyptic number.

It is an amenable number.

21101010122001 is a deficient number, since it is larger than the sum of its proper divisors (7970516834655).

21101010122001 is an equidigital number, since it uses as much as digits as its factorization.

21101010122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7319115612 (or 7319115581 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101010122001 its reverse (10022101010112), we get a palindrome (31123111132113).

The spelling of 21101010122001 in words is "twenty-one trillion, one hundred one billion, ten million, one hundred twenty-two thousand, one".