21454500320115 has 32 divisors (see below), whose sum is σ = 36383423049216. Its totient is φ = 10758362119680.

The previous prime is 21454500320093. The next prime is 21454500320129. The reversal of 21454500320115 is 51102300545412.

It is not a de Polignac number, because 21454500320115 - 2¹⁵ = 21454500287347 is a prime.

It is a super-2 number, since 2×21454500320115² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42544501 + ... + 43045830.

It is an arithmetic number, because the mean of its divisors is an integer number (1136981970288).

Almost surely, 2^{21454500320115} is an apocalyptic number.

21454500320115 is a deficient number, since it is larger than the sum of its proper divisors (14928922729101).

21454500320115 is a wasteful number, since it uses less digits than its factorization.

21454500320115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85591339.

The product of its (nonzero) digits is 24000, while the sum is 33.

Adding to 21454500320115 its reverse (51102300545412), we get a palindrome (72556800865527).

The spelling of 21454500320115 in words is "twenty-one trillion, four hundred fifty-four billion, five hundred million, three hundred twenty thousand, one hundred fifteen".