21110101222001 has 4 divisors (see below), whose sum is σ = 23029201333104. Its totient is φ = 19191001110900.

The previous prime is 21110101221983. The next prime is 21110101222031. The reversal of 21110101222001 is 10022210101112.

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 not a de Polignac number, because 21110101222001 - 2²⁶ = 21110034113137 is a prime.

It is a super-2 number, since 2×21110101222001² (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 (21110101222031) 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, 959550055535 + ... + 959550055556.

It is an arithmetic number, because the mean of its divisors is an integer number (5757300333276).

Almost surely, 2^{21110101222001} is an apocalyptic number.

It is an amenable number.

21110101222001 is a deficient number, since it is larger than the sum of its proper divisors (1919100111103).

21110101222001 is a wasteful number, since it uses less digits than its factorization.

21110101222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919100111102.

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

Adding to 21110101222001 its reverse (10022210101112), we get a palindrome (31132311323113).

The spelling of 21110101222001 in words is "twenty-one trillion, one hundred ten billion, one hundred one million, two hundred twenty-two thousand, one".