1215401443355 has 16 divisors (see below), whose sum is σ = 1591174088928. Its totient is φ = 883871040000.

The previous prime is 1215401443271. The next prime is 1215401443379. The reversal of 1215401443355 is 5533441045121.

It is not a de Polignac number, because 1215401443355 - 2⁸ = 1215401443099 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149825 + ... + 1566285.

It is an arithmetic number, because the mean of its divisors is an integer number (99448380558).

Almost surely, 2^{1215401443355} is an apocalyptic number.

1215401443355 is a deficient number, since it is larger than the sum of its proper divisors (375772645573).

1215401443355 is a wasteful number, since it uses less digits than its factorization.

1215401443355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432078.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 1215401443355 its reverse (5533441045121), we get a palindrome (6748842488476).

The spelling of 1215401443355 in words is "one trillion, two hundred fifteen billion, four hundred one million, four hundred forty-three thousand, three hundred fifty-five".