21242104131 has 8 divisors (see below), whose sum is σ = 28325965504. Its totient is φ = 14159822760.

The previous prime is 21242104111. The next prime is 21242104187. The reversal of 21242104131 is 13140124212.

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

It is not a de Polignac number, because 21242104131 - 2⁵ = 21242104099 is a prime.

It is a super-2 number, since 2×21242104131² (a number of 21 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 = 21242104098 and 21242104107.

It is not an unprimeable number, because it can be changed into a prime (21242104111) 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, 363265 + ... + 417666.

It is an arithmetic number, because the mean of its divisors is an integer number (3540745688).

Almost surely, 2^21242104131 is an apocalyptic number.

21242104131 is a deficient number, since it is larger than the sum of its proper divisors (7083861373).

21242104131 is an equidigital number, since it uses as much as digits as its factorization.

21242104131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790001.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21242104131 its reverse (13140124212), we get a palindrome (34382228343).

The spelling of 21242104131 in words is "twenty-one billion, two hundred forty-two million, one hundred four thousand, one hundred thirty-one".