1211450243155 has 8 divisors (see below), whose sum is σ = 1453751479872. Its totient is φ = 969152735808.

The previous prime is 1211450243137. The next prime is 1211450243197. The reversal of 1211450243155 is 5513420541121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211450243155 - 2²³ = 1211441854547 is a prime.

It is a super-3 number, since 3×1211450243155³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1211450243155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159442 + ... + 1564711.

It is an arithmetic number, because the mean of its divisors is an integer number (181718934984).

Almost surely, 2^{1211450243155} is an apocalyptic number.

1211450243155 is a deficient number, since it is larger than the sum of its proper divisors (242301236717).

1211450243155 is a wasteful number, since it uses less digits than its factorization.

1211450243155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864685.

The product of its (nonzero) digits is 24000, while the sum is 34.

Adding to 1211450243155 its reverse (5513420541121), we get a palindrome (6724870784276).

The spelling of 1211450243155 in words is "one trillion, two hundred eleven billion, four hundred fifty million, two hundred forty-three thousand, one hundred fifty-five".