21210120001211 has 8 divisors (see below), whose sum is σ = 21302970327600. Its totient is φ = 21117271672800.

The previous prime is 21210120001117. The next prime is 21210120001349. The reversal of 21210120001211 is 11210002101212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21210120001211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210120601211) 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, 23242625 + ... + 24137933.

It is an arithmetic number, because the mean of its divisors is an integer number (2662871290950).

Almost surely, 2^{21210120001211} is an apocalyptic number.

21210120001211 is a deficient number, since it is larger than the sum of its proper divisors (92850326389).

21210120001211 is a wasteful number, since it uses less digits than its factorization.

21210120001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998989.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21210120001211 its reverse (11210002101212), we get a palindrome (32420122102423).

The spelling of 21210120001211 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one thousand, two hundred eleven".