215400455129 has 16 divisors (see below), whose sum is σ = 228310790400. Its totient is φ = 202884482304.

The previous prime is 215400455099. The next prime is 215400455147. The reversal of 215400455129 is 921554004512.

It is a cyclic number.

It is not a de Polignac number, because 215400455129 - 2³⁶ = 146680978393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215400455092 and 215400455101.

It is not an unprimeable number, because it can be changed into a prime (215400451129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161057 + ... + 675825.

It is an arithmetic number, because the mean of its divisors is an integer number (14269424400).

Almost surely, 2^215400455129 is an apocalyptic number.

215400455129 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

215400455129 is a deficient number, since it is larger than the sum of its proper divisors (12910335271).

215400455129 is a wasteful number, since it uses less digits than its factorization.

215400455129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515152.

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 215400455129 in words is "two hundred fifteen billion, four hundred million, four hundred fifty-five thousand, one hundred twenty-nine".