1211253354605 has 32 divisors (see below), whose sum is σ = 1673317267200. Its totient is φ = 824495639040.

The previous prime is 1211253354601. The next prime is 1211253354617. The reversal of 1211253354605 is 5064533521121.

It is not a de Polignac number, because 1211253354605 - 2² = 1211253354601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211253354601) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 8571170 + ... + 8711340.

It is an arithmetic number, because the mean of its divisors is an integer number (52291164600).

Almost surely, 2^{1211253354605} is an apocalyptic number.

It is an amenable number.

1211253354605 is a deficient number, since it is larger than the sum of its proper divisors (462063912595).

1211253354605 is a wasteful number, since it uses less digits than its factorization.

1211253354605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141989.

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 1211253354605 its reverse (5064533521121), we get a palindrome (6275786875726).

The spelling of 1211253354605 in words is "one trillion, two hundred eleven billion, two hundred fifty-three million, three hundred fifty-four thousand, six hundred five".