1211671138240 has 56 divisors (see below), whose sum is σ = 2889579620880. Its totient is φ = 483948208128.

The previous prime is 1211671138199. The next prime is 1211671138289. The reversal of 1211671138240 is 428311761121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211671138240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2597770 + ... + 3028489.

Almost surely, 2^{1211671138240} is an apocalyptic number.

1211671138240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211671138240 is an abundant number, since it is smaller than the sum of its proper divisors (1677908482640).

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

1211671138240 is an equidigital number, since it uses as much as digits as its factorization.

1211671138240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5626949 (or 5626939 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

Adding to 1211671138240 its reverse (428311761121), we get a palindrome (1639982899361).

The spelling of 1211671138240 in words is "one trillion, two hundred eleven billion, six hundred seventy-one million, one hundred thirty-eight thousand, two hundred forty".