21220200211121 has 8 divisors (see below), whose sum is σ = 21267533193984. Its totient is φ = 21172872866320.

The previous prime is 21220200211079. The next prime is 21220200211123. The reversal of 21220200211121 is 12111200202212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21220200211121 - 2⁴² = 16822153700017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220200211121.

It is not an unprimeable number, because it can be changed into a prime (21220200211123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6171776 + ... + 8973918.

It is an arithmetic number, because the mean of its divisors is an integer number (2658441649248).

Almost surely, 2^{21220200211121} is an apocalyptic number.

It is an amenable number.

21220200211121 is a deficient number, since it is larger than the sum of its proper divisors (47332982863).

21220200211121 is a wasteful number, since it uses less digits than its factorization.

21220200211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819031.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220200211121 its reverse (12111200202212), we get a palindrome (33331400413333).

The spelling of 21220200211121 in words is "twenty-one trillion, two hundred twenty billion, two hundred million, two hundred eleven thousand, one hundred twenty-one".