21220211110001 has 16 divisors (see below), whose sum is σ = 22595323040640. Its totient is φ = 19859208464640.

The previous prime is 21220211109991. The next prime is 21220211110003. The reversal of 21220211110001 is 10001111202212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21220211110001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220211110003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53300660 + ... + 53697306.

It is an arithmetic number, because the mean of its divisors is an integer number (1412207690040).

Almost surely, 2^{21220211110001} is an apocalyptic number.

It is an amenable number.

21220211110001 is a deficient number, since it is larger than the sum of its proper divisors (1375111930639).

21220211110001 is a wasteful number, since it uses less digits than its factorization.

21220211110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414424.

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

Adding to 21220211110001 its reverse (10001111202212), we get a palindrome (31221322312213).

The spelling of 21220211110001 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, one hundred ten thousand, one".