21121112220101 has 8 divisors (see below), whose sum is σ = 21159236358624. Its totient is φ = 21082995370800.

The previous prime is 21121112220059. The next prime is 21121112220107. The reversal of 21121112220101 is 10102221112112.

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

It is a cyclic number.

It is not a de Polignac number, because 21121112220101 - 2⁶ = 21121112220037 is a prime.

It is a super-2 number, since 2×21121112220101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21121112220101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121112220107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3994826 + ... + 7628948.

It is an arithmetic number, because the mean of its divisors is an integer number (2644904544828).

Almost surely, 2^{21121112220101} is an apocalyptic number.

It is an amenable number.

21121112220101 is a deficient number, since it is larger than the sum of its proper divisors (38124138523).

21121112220101 is an equidigital number, since it uses as much as digits as its factorization.

21121112220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3644611.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21121112220101 its reverse (10102221112112), we get a palindrome (31223333332213).

The spelling of 21121112220101 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred one".