21655032604241 has 4 divisors (see below), whose sum is σ = 21656254068900. Its totient is φ = 21653811139584.

The previous prime is 21655032604229. The next prime is 21655032604291. The reversal of 21655032604241 is 14240623055612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17846695966225 + 3808336638016 = 4224535^2 + 1951496^2 .

It is a cyclic number.

It is not a de Polignac number, because 21655032604241 - 2¹⁴ = 21655032587857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21655032604211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610705736 + ... + 610741193.

It is an arithmetic number, because the mean of its divisors is an integer number (5414063517225).

Almost surely, 2^{21655032604241} is an apocalyptic number.

It is an amenable number.

21655032604241 is a deficient number, since it is larger than the sum of its proper divisors (1221464659).

21655032604241 is a wasteful number, since it uses less digits than its factorization.

21655032604241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1221464658.

The product of its (nonzero) digits is 345600, while the sum is 41.

Adding to 21655032604241 its reverse (14240623055612), we get a palindrome (35895655659853).

The spelling of 21655032604241 in words is "twenty-one trillion, six hundred fifty-five billion, thirty-two million, six hundred four thousand, two hundred forty-one".