21212100110001 has 64 divisors (see below), whose sum is σ = 31887717048320. Its totient is φ = 12484496148480.

The previous prime is 21212100109957. The next prime is 21212100110017. The reversal of 21212100110001 is 10001100121212.

It is not a de Polignac number, because 21212100110001 - 2⁷ = 21212100109873 is a prime.

It is a super-3 number, since 3×21212100110001³ (a number of 41 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212100110501) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4669350 + ... + 8014176.

It is an arithmetic number, because the mean of its divisors is an integer number (498245578880).

Almost surely, 2^{21212100110001} is an apocalyptic number.

It is an amenable number.

21212100110001 is a deficient number, since it is larger than the sum of its proper divisors (10675616938319).

21212100110001 is a wasteful number, since it uses less digits than its factorization.

21212100110001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345014.

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

Adding to 21212100110001 its reverse (10001100121212), we get a palindrome (31213200231213).

The spelling of 21212100110001 in words is "twenty-one trillion, two hundred twelve billion, one hundred million, one hundred ten thousand, one".