21477348548678 has 64 divisors (see below), whose sum is σ = 38009485578240. Its totient is φ = 9002244873600.

The previous prime is 21477348548659. The next prime is 21477348548681. The reversal of 21477348548678 is 87684584377412.

It is a super-2 number, since 2×21477348548678² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (74).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 3221558 + ... + 7302953.

It is an arithmetic number, because the mean of its divisors is an integer number (593898212160).

Almost surely, 2^{21477348548678} is an apocalyptic number.

21477348548678 is a deficient number, since it is larger than the sum of its proper divisors (16532137029562).

21477348548678 is a wasteful number, since it uses less digits than its factorization.

21477348548678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10524693.

The product of its digits is 2023096320, while the sum is 74.

The spelling of 21477348548678 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred forty-eight million, five hundred forty-eight thousand, six hundred seventy-eight".