21001100121211 has 8 divisors (see below), whose sum is σ = 24026442238944. Its totient is φ = 17982054242880.

The previous prime is 21001100121167. The next prime is 21001100121223. The reversal of 21001100121211 is 11212100110012.

It is a happy number.

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

It is not a de Polignac number, because 21001100121211 - 2³⁹ = 20451344307323 is a prime.

It is a super-2 number, since 2×21001100121211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001100121191 and 21001100121200.

It is not an unprimeable number, because it can be changed into a prime (21001100121241) 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, 1574052700 + ... + 1574066041.

It is an arithmetic number, because the mean of its divisors is an integer number (3003305279868).

Almost surely, 2^{21001100121211} is an apocalyptic number.

21001100121211 is a deficient number, since it is larger than the sum of its proper divisors (3025342117733).

21001100121211 is an equidigital number, since it uses as much as digits as its factorization.

21001100121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148119701.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21001100121211 its reverse (11212100110012), we get a palindrome (32213200231223).

The spelling of 21001100121211 in words is "twenty-one trillion, one billion, one hundred million, one hundred twenty-one thousand, two hundred eleven".