1213131122455 has 32 divisors (see below), whose sum is σ = 1792014681600. Its totient is φ = 769751724672.

The previous prime is 1213131122431. The next prime is 1213131122477. The reversal of 1213131122455 is 5542211313121.

It is not a de Polignac number, because 1213131122455 - 2¹⁹ = 1213130598167 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21183700 + ... + 21240889.

It is an arithmetic number, because the mean of its divisors is an integer number (56000458800).

Almost surely, 2^{1213131122455} is an apocalyptic number.

1213131122455 is a deficient number, since it is larger than the sum of its proper divisors (578883559145).

1213131122455 is a wasteful number, since it uses less digits than its factorization.

1213131122455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42424663.

The product of its digits is 7200, while the sum is 31.

Adding to 1213131122455 its reverse (5542211313121), we get a palindrome (6755342435576).

The spelling of 1213131122455 in words is "one trillion, two hundred thirteen billion, one hundred thirty-one million, one hundred twenty-two thousand, four hundred fifty-five".