21212002211001 has 16 divisors (see below), whose sum is σ = 32329766922624. Its totient is φ = 12118625645184.

The previous prime is 21212002210901. The next prime is 21212002211003. The reversal of 21212002211001 is 10011220021212.

It is not a de Polignac number, because 21212002211001 - 2²² = 21211998016697 is a prime.

It is a super-2 number, since 2×21212002211001² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21212002211003) 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, 104832996 + ... + 105035141.

It is an arithmetic number, because the mean of its divisors is an integer number (2020610432664).

Almost surely, 2^{21212002211001} is an apocalyptic number.

21212002211001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21212002211001 is a deficient number, since it is larger than the sum of its proper divisors (11117764711623).

21212002211001 is a wasteful number, since it uses less digits than its factorization.

21212002211001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209872960.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212002211001 its reverse (10011220021212), we get a palindrome (31223222232213).

The spelling of 21212002211001 in words is "twenty-one trillion, two hundred twelve billion, two million, two hundred eleven thousand, one".