1321315555554 has 24 divisors (see below), whose sum is σ = 2862905834880. Its totient is φ = 440429985528.

The previous prime is 1321315555543. The next prime is 1321315555561. The reversal of 1321315555554 is 4555555131231.

1321315555554 is a `hidden beast` number, since 1 + 32 + 1 + 3 + 15 + 5 + 55 + 554 = 666.

It is a super-3 number, since 3×1321315555554³ (a number of 37 digits) contains 333 as substring.

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 11 ways as a sum of consecutive naturals, for example, 281239 + ... + 1649765.

It is an arithmetic number, because the mean of its divisors is an integer number (119287743120).

Almost surely, 2^{1321315555554} is an apocalyptic number.

1321315555554 is an abundant number, since it is smaller than the sum of its proper divisors (1541590279326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321315555554 is a wasteful number, since it uses less digits than its factorization.

1321315555554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422174 (or 1422171 counting only the distinct ones).

The product of its digits is 1125000, while the sum is 45.

The spelling of 1321315555554 in words is "one trillion, three hundred twenty-one billion, three hundred fifteen million, five hundred fifty-five thousand, five hundred fifty-four".