21121211011101 has 8 divisors (see below), whose sum is σ = 28162205250144. Its totient is φ = 14080512056400.

The previous prime is 21121211011099. The next prime is 21121211011123. The reversal of 21121211011101 is 10111011212112.

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

It is not a de Polignac number, because 21121211011101 - 2¹ = 21121211011099 is a prime.

It is a super-2 number, since 2×21121211011101² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121211011171) 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, 73654131 + ... + 73940336.

It is an arithmetic number, because the mean of its divisors is an integer number (3520275656268).

Almost surely, 2^{21121211011101} is an apocalyptic number.

It is an amenable number.

21121211011101 is a deficient number, since it is larger than the sum of its proper divisors (7040994239043).

21121211011101 is a wasteful number, since it uses less digits than its factorization.

21121211011101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147642171.

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

Adding to 21121211011101 its reverse (10111011212112), we get a palindrome (31232222223213).

The spelling of 21121211011101 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred eleven million, eleven thousand, one hundred one".