20210111021221 has 32 divisors (see below), whose sum is σ = 22758757422336. Its totient is φ = 17790289920000.

The previous prime is 20210111021201. The next prime is 20210111021237. The reversal of 20210111021221 is 12212011101202.

It is a cyclic number.

It is not a de Polignac number, because 20210111021221 - 2²³ = 20210102632613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210111021195 and 20210111021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210111021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17760805 + ... + 18864421.

It is an arithmetic number, because the mean of its divisors is an integer number (711211169448).

Almost surely, 2^{20210111021221} is an apocalyptic number.

It is an amenable number.

20210111021221 is a deficient number, since it is larger than the sum of its proper divisors (2548646401115).

20210111021221 is a wasteful number, since it uses less digits than its factorization.

20210111021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104093.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20210111021221 its reverse (12212011101202), we get a palindrome (32422122122423).

The spelling of 20210111021221 in words is "twenty trillion, two hundred ten billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".