21121110101211 has 8 divisors (see below), whose sum is σ = 28178414284800. Its totient is φ = 14072272992552.

The previous prime is 21121110101111. The next prime is 21121110101303. The reversal of 21121110101211 is 11210101112112.

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

It is not a de Polignac number, because 21121110101211 - 2²⁶ = 21121042992347 is a prime.

It is a super-2 number, since 2×21121110101211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121110101011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2116762911 + ... + 2116772888.

It is an arithmetic number, because the mean of its divisors is an integer number (3522301785600).

Almost surely, 2^{21121110101211} is an apocalyptic number.

21121110101211 is a deficient number, since it is larger than the sum of its proper divisors (7057304183589).

21121110101211 is a wasteful number, since it uses less digits than its factorization.

21121110101211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4233537465.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21121110101211 its reverse (11210101112112), we get a palindrome (32331211213323).

The spelling of 21121110101211 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred ten million, one hundred one thousand, two hundred eleven".