20212021111 has 8 divisors (see below), whose sum is σ = 21217651200. Its totient is φ = 19228492920.

The previous prime is 20212021099. The next prime is 20212021133. The reversal of 20212021111 is 11112021202.

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 20212021111 - 2⁵ = 20212021079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212021091 and 20212021100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212021211) 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 7 ways as a sum of consecutive naturals, for example, 5523601 + ... + 5527258.

It is an arithmetic number, because the mean of its divisors is an integer number (2652206400).

Almost surely, 2^20212021111 is an apocalyptic number.

20212021111 is a deficient number, since it is larger than the sum of its proper divisors (1005630089).

20212021111 is a wasteful number, since it uses less digits than its factorization.

20212021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11050949.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20212021111 its reverse (11112021202), we get a palindrome (31324042313).

Subtracting from 20212021111 its reverse (11112021202), we obtain a palindrome (9099999909).

It can be divided in two parts, 2021202 and 1111, that multiplied together give a palindrome (2245555422).

The spelling of 20212021111 in words is "twenty billion, two hundred twelve million, twenty-one thousand, one hundred eleven".