21404041550047 has 8 divisors (see below), whose sum is σ = 23055734404080. Its totient is φ = 19753095570240.

The previous prime is 21404041549997. The next prime is 21404041550093. The reversal of 21404041550047 is 74005514040412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21404041550047 - 2²⁷ = 21403907332319 is a prime.

It is a super-2 number, since 2×21404041550047² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21404041549988 and 21404041550015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404041556047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186659029 + ... + 186773662.

It is an arithmetic number, because the mean of its divisors is an integer number (2881966800510).

Almost surely, 2^{21404041550047} is an apocalyptic number.

21404041550047 is a deficient number, since it is larger than the sum of its proper divisors (1651692854033).

21404041550047 is a wasteful number, since it uses less digits than its factorization.

21404041550047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373437113.

The product of its (nonzero) digits is 89600, while the sum is 37.

Adding to 21404041550047 its reverse (74005514040412), we get a palindrome (95409555590459).

The spelling of 21404041550047 in words is "twenty-one trillion, four hundred four billion, forty-one million, five hundred fifty thousand, forty-seven".