1211155134144 has 28 divisors (see below), whose sum is σ = 3204514626264. Its totient is φ = 403718377984.

The previous prime is 1211155134107. The next prime is 1211155134209. The reversal of 1211155134144 is 4414315511121.

It is a super-2 number, since 2×1211155134144² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3154049637 + ... + 3154050020.

It is an arithmetic number, because the mean of its divisors is an integer number (114446950938).

Almost surely, 2^{1211155134144} is an apocalyptic number.

It is an amenable number.

1211155134144 is an abundant number, since it is smaller than the sum of its proper divisors (1993359492120).

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

1211155134144 is an equidigital number, since it uses as much as digits as its factorization.

1211155134144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6308099672 (or 6308099662 counting only the distinct ones).

The product of its digits is 9600, while the sum is 33.

The spelling of 1211155134144 in words is "one trillion, two hundred eleven billion, one hundred fifty-five million, one hundred thirty-four thousand, one hundred forty-four".