1211401553235 has 16 divisors (see below), whose sum is σ = 1983317892864. Its totient is φ = 631055692512.

The previous prime is 1211401553207. The next prime is 1211401553261. The reversal of 1211401553235 is 5323551041121.

It is not a de Polignac number, because 1211401553235 - 2⁸ = 1211401552979 is a prime.

It is a super-3 number, since 3×1211401553235³ (a number of 37 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211401553196 and 1211401553205.

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 15 ways as a sum of consecutive naturals, for example, 939070327 + ... + 939071616.

It is an arithmetic number, because the mean of its divisors is an integer number (123957368304).

Almost surely, 2^{1211401553235} is an apocalyptic number.

1211401553235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1211401553235 is a deficient number, since it is larger than the sum of its proper divisors (771916339629).

1211401553235 is a wasteful number, since it uses less digits than its factorization.

1211401553235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1878141994.

The product of its (nonzero) digits is 18000, while the sum is 33.

Adding to 1211401553235 its reverse (5323551041121), we get a palindrome (6534952594356).

The spelling of 1211401553235 in words is "one trillion, two hundred eleven billion, four hundred one million, five hundred fifty-three thousand, two hundred thirty-five".