21111122112101 has 8 divisors (see below), whose sum is σ = 24127046231424. Its totient is φ = 18095210375760.

The previous prime is 21111122112089. The next prime is 21111122112137. The reversal of 21111122112101 is 10121122111112.

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

It is not a de Polignac number, because 21111122112101 - 2³⁴ = 21093942242917 is a prime.

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 21111122112101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111122112161) 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, 901616 + ... + 6560118.

It is an arithmetic number, because the mean of its divisors is an integer number (3015880778928).

Almost surely, 2^{21111122112101} is an apocalyptic number.

It is an amenable number.

21111122112101 is a deficient number, since it is larger than the sum of its proper divisors (3015924119323).

21111122112101 is an equidigital number, since it uses as much as digits as its factorization.

21111122112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6191491.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 21111122112101 its reverse (10121122111112), we get a palindrome (31232244223213).

The spelling of 21111122112101 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-two million, one hundred twelve thousand, one hundred one".