20011220002111 has 16 divisors (see below), whose sum is σ = 21670735515520. Its totient is φ = 18368885237760.

The previous prime is 20011220002057. The next prime is 20011220002141. The reversal of 20011220002111 is 11120002211002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20011220002111 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 20011220002091 and 20011220002100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011220002141) 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, 47185375 + ... + 47607583.

It is an arithmetic number, because the mean of its divisors is an integer number (1354420969720).

Almost surely, 2^{20011220002111} is an apocalyptic number.

20011220002111 is a deficient number, since it is larger than the sum of its proper divisors (1659515513409).

20011220002111 is a wasteful number, since it uses less digits than its factorization.

20011220002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442546.

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

Adding to 20011220002111 its reverse (11120002211002), we get a palindrome (31131222213113).

The spelling of 20011220002111 in words is "twenty trillion, eleven billion, two hundred twenty million, two thousand, one hundred eleven".