1212351121545 has 16 divisors (see below), whose sum is σ = 2002334756352. Its totient is φ = 625729610880.

The previous prime is 1212351121543. The next prime is 1212351121549. The reversal of 1212351121545 is 5451211532121.

It is not a de Polignac number, because 1212351121545 - 2¹ = 1212351121543 is a prime.

It is a super-3 number, since 3×1212351121545³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212351121543) 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, 1303602892 + ... + 1303603821.

It is an arithmetic number, because the mean of its divisors is an integer number (125145922272).

Almost surely, 2^{1212351121545} is an apocalyptic number.

1212351121545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1212351121545 is a deficient number, since it is larger than the sum of its proper divisors (789983634807).

1212351121545 is a wasteful number, since it uses less digits than its factorization.

1212351121545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2607206752.

The product of its digits is 12000, while the sum is 33.

Adding to 1212351121545 its reverse (5451211532121), we get a palindrome (6663562653666).

It can be divided in two parts, 12123511 and 21545, that added together give a triangular number (12145056 = T₄₉₂₈).

The spelling of 1212351121545 in words is "one trillion, two hundred twelve billion, three hundred fifty-one million, one hundred twenty-one thousand, five hundred forty-five".