20021211001111 has 16 divisors (see below), whose sum is σ = 21207178317600. Its totient is φ = 18836161763328.

The previous prime is 20021211001109. The next prime is 20021211001219. The reversal of 20021211001111 is 11110011212002.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20021211001111 - 2¹ = 20021211001109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021211001091 and 20021211001100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021211004111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 562865935 + ... + 562901503.

It is an arithmetic number, because the mean of its divisors is an integer number (1325448644850).

Almost surely, 2^{20021211001111} is an apocalyptic number.

20021211001111 is a deficient number, since it is larger than the sum of its proper divisors (1185967316489).

20021211001111 is a wasteful number, since it uses less digits than its factorization.

20021211001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47538.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20021211001111 its reverse (11110011212002), we get a palindrome (31131222213113).

The spelling of 20021211001111 in words is "twenty trillion, twenty-one billion, two hundred eleven million, one thousand, one hundred eleven".