1321141501555 has 4 divisors (see below), whose sum is σ = 1585369801872. Its totient is φ = 1056913201240.

The previous prime is 1321141501531. The next prime is 1321141501621. The reversal of 1321141501555 is 5551051411231.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1321141501555 - 2⁵ = 1321141501523 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321141501555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132114150151 + ... + 132114150160.

It is an arithmetic number, because the mean of its divisors is an integer number (396342450468).

Almost surely, 2^{1321141501555} is an apocalyptic number.

1321141501555 is a deficient number, since it is larger than the sum of its proper divisors (264228300317).

1321141501555 is an equidigital number, since it uses as much as digits as its factorization.

1321141501555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264228300316.

The product of its (nonzero) digits is 15000, while the sum is 34.

Adding to 1321141501555 its reverse (5551051411231), we get a palindrome (6872192912786).

The spelling of 1321141501555 in words is "one trillion, three hundred twenty-one billion, one hundred forty-one million, five hundred one thousand, five hundred fifty-five".