11971138229886 has 64 divisors (see below), whose sum is σ = 27661754223360. Its totient is φ = 3413425359360.

The previous prime is 11971138229857. The next prime is 11971138229891. The reversal of 11971138229886 is 68892283117911.

It is a super-2 number, since 2×11971138229886² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3526020 + ... + 6031176.

It is an arithmetic number, because the mean of its divisors is an integer number (432214909740).

Almost surely, 2^{11971138229886} is an apocalyptic number.

11971138229886 is an abundant number, since it is smaller than the sum of its proper divisors (15690615993474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11971138229886 is a wasteful number, since it uses less digits than its factorization.

11971138229886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2509449.

The product of its digits is 20901888, while the sum is 66.

The spelling of 11971138229886 in words is "eleven trillion, nine hundred seventy-one billion, one hundred thirty-eight million, two hundred twenty-nine thousand, eight hundred eighty-six".