21111001221101 has 4 divisors (see below), whose sum is σ = 23030183150304. Its totient is φ = 19191819291900.

The previous prime is 21111001221031. The next prime is 21111001221173. The reversal of 21111001221101 is 10112210011112.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21111001221101 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111001221901) 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, 959590964585 + ... + 959590964606.

It is an arithmetic number, because the mean of its divisors is an integer number (5757545787576).

Almost surely, 2^{21111001221101} is an apocalyptic number.

It is an amenable number.

21111001221101 is a deficient number, since it is larger than the sum of its proper divisors (1919181929203).

21111001221101 is a wasteful number, since it uses less digits than its factorization.

21111001221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919181929202.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21111001221101 its reverse (10112210011112), we get a palindrome (31223211232213).

The spelling of 21111001221101 in words is "twenty-one trillion, one hundred eleven billion, one million, two hundred twenty-one thousand, one hundred one".