11381111111381 has 16 divisors (see below), whose sum is σ = 12844431455040. Its totient is φ = 9989266654080.

The previous prime is 11381111111339. The next prime is 11381111111389. The reversal of 11381111111381 is 18311111118311.

It is a cyclic number.

It is not a de Polignac number, because 11381111111381 - 2²² = 11381106917077 is a prime.

It is a super-2 number, since 2×11381111111381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11381111111389) 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, 6904670 + ... + 8392656.

It is an arithmetic number, because the mean of its divisors is an integer number (802776965940).

Almost surely, 2^{11381111111381} is an apocalyptic number.

11381111111381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11381111111381 is a deficient number, since it is larger than the sum of its proper divisors (1463320343659).

11381111111381 is a wasteful number, since it uses less digits than its factorization.

11381111111381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512004.

The product of its digits is 576, while the sum is 32.

Adding to 11381111111381 its reverse (18311111118311), we get a palindrome (29692222229692).

The spelling of 11381111111381 in words is "eleven trillion, three hundred eighty-one billion, one hundred eleven million, one hundred eleven thousand, three hundred eighty-one".