1211442123005 has 16 divisors (see below), whose sum is σ = 1456218819504. Its totient is φ = 967495526400.

The previous prime is 1211442122999. The next prime is 1211442123013. The reversal of 1211442123005 is 5003212441121.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4489402009 + 1206952720996 = 67003^2 + 1098614^2 .

It is not a de Polignac number, because 1211442123005 - 2²⁴ = 1211425345789 is a prime.

It is a super-3 number, since 3×1211442123005³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15236855 + ... + 15316155.

It is an arithmetic number, because the mean of its divisors is an integer number (91013676219).

Almost surely, 2^{1211442123005} is an apocalyptic number.

It is an amenable number.

1211442123005 is a deficient number, since it is larger than the sum of its proper divisors (244776696499).

1211442123005 is an equidigital number, since it uses as much as digits as its factorization.

1211442123005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84496.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 1211442123005 its reverse (5003212441121), we get a palindrome (6214654564126).

The spelling of 1211442123005 in words is "one trillion, two hundred eleven billion, four hundred forty-two million, one hundred twenty-three thousand, five".