20111111001111 has 16 divisors (see below), whose sum is σ = 28877817317216. Its totient is φ = 12375929195136.

The previous prime is 20111111001103. The next prime is 20111111001119. The reversal of 20111111001111 is 11110011111102.

It is an interprime number because it is at equal distance from previous prime (20111111001103) and next prime (20111111001119).

It is not a de Polignac number, because 20111111001111 - 2³ = 20111111001103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111111001119) 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, 671541 + ... + 6377553.

It is an arithmetic number, because the mean of its divisors is an integer number (1804863582326).

Almost surely, 2^{20111111001111} is an apocalyptic number.

20111111001111 is a deficient number, since it is larger than the sum of its proper divisors (8766706316105).

20111111001111 is a wasteful number, since it uses less digits than its factorization.

20111111001111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5796402.

The product of its (nonzero) digits is 2, while the sum is 12.

Adding to 20111111001111 its reverse (11110011111102), we get a palindrome (31221122112213).

The spelling of 20111111001111 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, one thousand, one hundred eleven".