1211110020221 has 16 divisors (see below), whose sum is σ = 1240296634368. Its totient is φ = 1182167750400.

The previous prime is 1211110020209. The next prime is 1211110020299. The reversal of 1211110020221 is 1220200111121.

It is a cyclic number.

It is not a de Polignac number, because 1211110020221 - 2³⁰ = 1210036278397 is a prime.

It is a super-2 number, since 2×1211110020221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211110020196 and 1211110020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211110320221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13122980 + ... + 13214946.

It is an arithmetic number, because the mean of its divisors is an integer number (77518539648).

Almost surely, 2^{1211110020221} is an apocalyptic number.

It is an amenable number.

1211110020221 is a deficient number, since it is larger than the sum of its proper divisors (29186614147).

1211110020221 is a wasteful number, since it uses less digits than its factorization.

1211110020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93292.

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

Adding to 1211110020221 its reverse (1220200111121), we get a palindrome (2431310131342).

The spelling of 1211110020221 in words is "one trillion, two hundred eleven billion, one hundred ten million, twenty thousand, two hundred twenty-one".