115421204015551 has 16 divisors (see below), whose sum is σ = 132774756132096. Its totient is φ = 98285720570496.

The previous prime is 115421204015527. The next prime is 115421204015563. The reversal of 115421204015551 is 155510402124511.

It is a cyclic number.

It is not a de Polignac number, because 115421204015551 - 2⁷ = 115421204015423 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 115421204015551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115421204015501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77028426 + ... + 78512551.

It is an arithmetic number, because the mean of its divisors is an integer number (8298422258256).

Almost surely, 2^{115421204015551} is an apocalyptic number.

115421204015551 is a deficient number, since it is larger than the sum of its proper divisors (17353552116545).

115421204015551 is a wasteful number, since it uses less digits than its factorization.

115421204015551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155541678.

The product of its (nonzero) digits is 40000, while the sum is 37.

The spelling of 115421204015551 in words is "one hundred fifteen trillion, four hundred twenty-one billion, two hundred four million, fifteen thousand, five hundred fifty-one".