21022120111001 has 4 divisors (see below), whose sum is σ = 21022129542672. Its totient is φ = 21022110679332.

The previous prime is 21022120110923. The next prime is 21022120111009. The reversal of 21022120111001 is 10011102122012.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21022120111001 is a prime.

It is a super-2 number, since 2×21022120111001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022120111009) 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 3 ways as a sum of consecutive naturals, for example, 703166 + ... + 6522168.

It is an arithmetic number, because the mean of its divisors is an integer number (5255532385668).

Almost surely, 2^{21022120111001} is an apocalyptic number.

It is an amenable number.

21022120111001 is a deficient number, since it is larger than the sum of its proper divisors (9431671).

21022120111001 is an equidigital number, since it uses as much as digits as its factorization.

21022120111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9431670.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21022120111001 its reverse (10011102122012), we get a palindrome (31033222233013).

The spelling of 21022120111001 in words is "twenty-one trillion, twenty-two billion, one hundred twenty million, one hundred eleven thousand, one".