11451212155 has 16 divisors (see below), whose sum is σ = 14558110560. Its totient is φ = 8617149952.

The previous prime is 11451212153. The next prime is 11451212197. The reversal of 11451212155 is 55121215411.

It is a cyclic number.

It is not a de Polignac number, because 11451212155 - 2¹ = 11451212153 is a prime.

It is a super-2 number, since 2×11451212155² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11451212153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114201 + ... + 189589.

It is an arithmetic number, because the mean of its divisors is an integer number (909881910).

Almost surely, 2^11451212155 is an apocalyptic number.

11451212155 is a deficient number, since it is larger than the sum of its proper divisors (3106898405).

11451212155 is a wasteful number, since it uses less digits than its factorization.

11451212155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77198.

The product of its digits is 2000, while the sum is 28.

Adding to 11451212155 its reverse (55121215411), we get a palindrome (66572427566).

The spelling of 11451212155 in words is "eleven billion, four hundred fifty-one million, two hundred twelve thousand, one hundred fifty-five".