21523504941 has 12 divisors (see below), whose sum is σ = 32092394880. Its totient is φ = 13886132040.

The previous prime is 21523504939. The next prime is 21523504967. The reversal of 21523504941 is 14940532512.

21523504941 is a `hidden beast` number, since 2 + 1 + 523 + 50 + 49 + 41 = 666.

It is not a de Polignac number, because 21523504941 - 2¹ = 21523504939 is a prime.

It is a super-2 number, since 2×21523504941² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21523504896 and 21523504905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21523504241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38572311 + ... + 38572868.

It is an arithmetic number, because the mean of its divisors is an integer number (2674366240).

Almost surely, 2^21523504941 is an apocalyptic number.

It is an amenable number.

21523504941 is a deficient number, since it is larger than the sum of its proper divisors (10568889939).

21523504941 is a wasteful number, since it uses less digits than its factorization.

21523504941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77145216 (or 77145213 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 21523504941 in words is "twenty-one billion, five hundred twenty-three million, five hundred four thousand, nine hundred forty-one".