20212001111 has 4 divisors (see below), whose sum is σ = 21090783792. Its totient is φ = 19333218432.

The previous prime is 20212001093. The next prime is 20212001113. The reversal of 20212001111 is 11110021202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20212001111 is a prime.

It is a super-2 number, since 2×20212001111² (a number of 21 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 = 20212001092 and 20212001101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212001113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439391306 + ... + 439391351.

It is an arithmetic number, because the mean of its divisors is an integer number (5272695948).

Almost surely, 2^20212001111 is an apocalyptic number.

20212001111 is a deficient number, since it is larger than the sum of its proper divisors (878782681).

20212001111 is an equidigital number, since it uses as much as digits as its factorization.

20212001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878782680.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20212001111 its reverse (11110021202), we get a palindrome (31322022313).

The spelling of 20212001111 in words is "twenty billion, two hundred twelve million, one thousand, one hundred eleven".