5515121021555 has 32 divisors (see below), whose sum is σ = 6725202785280. Its totient is φ = 4341029621760.

The previous prime is 5515121021551. The next prime is 5515121021567. The reversal of 5515121021555 is 5551201215155.

5515121021555 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 5515121021555 - 2² = 5515121021551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5515121021551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 425772959 + ... + 425785911.

It is an arithmetic number, because the mean of its divisors is an integer number (210162587040).

Almost surely, 2^{5515121021555} is an apocalyptic number.

5515121021555 is a deficient number, since it is larger than the sum of its proper divisors (1210081763725).

5515121021555 is a wasteful number, since it uses less digits than its factorization.

5515121021555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15791.

The product of its (nonzero) digits is 62500, while the sum is 38.

The spelling of 5515121021555 in words is "five trillion, five hundred fifteen billion, one hundred twenty-one million, twenty-one thousand, five hundred fifty-five".