21112101011121 has 4 divisors (see below), whose sum is σ = 28149468014832. Its totient is φ = 14074734007412.

The previous prime is 21112101011119. The next prime is 21112101011123. The reversal of 21112101011121 is 12111010121112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21112101011119) and next prime (21112101011123).

It is a cyclic number.

It is not a de Polignac number, because 21112101011121 - 2¹ = 21112101011119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112101011121.

It is not an unprimeable number, because it can be changed into a prime (21112101011123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3518683501851 + ... + 3518683501856.

It is an arithmetic number, because the mean of its divisors is an integer number (7037367003708).

Almost surely, 2^{21112101011121} is an apocalyptic number.

It is an amenable number.

21112101011121 is a deficient number, since it is larger than the sum of its proper divisors (7037367003711).

21112101011121 is an equidigital number, since it uses as much as digits as its factorization.

21112101011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037367003710.

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

Adding to 21112101011121 its reverse (12111010121112), we get a palindrome (33223111132233).

The spelling of 21112101011121 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, eleven thousand, one hundred twenty-one".