21202211201111 has 12 divisors (see below), whose sum is σ = 22523005781760. Its totient is φ = 19954808221440.

The previous prime is 21202211201063. The next prime is 21202211201183. The reversal of 21202211201111 is 11110211220212.

It is not a de Polignac number, because 21202211201111 - 2³⁴ = 21185031331927 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 21202211201111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202211209111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30884330 + ... + 31563368.

It is an arithmetic number, because the mean of its divisors is an integer number (1876917148480).

Almost surely, 2^{21202211201111} is an apocalyptic number.

21202211201111 is a deficient number, since it is larger than the sum of its proper divisors (1320794580649).

21202211201111 is a wasteful number, since it uses less digits than its factorization.

21202211201111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787114 (or 787097 counting only the distinct ones).

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

Adding to 21202211201111 its reverse (11110211220212), we get a palindrome (32312422421323).

The spelling of 21202211201111 in words is "twenty-one trillion, two hundred two billion, two hundred eleven million, two hundred one thousand, one hundred eleven".