21205410130 has 16 divisors (see below), whose sum is σ = 38181115224. Its totient is φ = 8479635840.

The previous prime is 21205410113. The next prime is 21205410137. The reversal of 21205410130 is 3101450212.

It can be written as a sum of positive squares in 4 ways, for example, as 19560539881 + 1644870249 = 139859^2 + 40557^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21205410098 and 21205410107.

It is not an unprimeable number, because it can be changed into a prime (21205410137) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 280611 + ... + 348070.

Almost surely, 2^21205410130 is an apocalyptic number.

21205410130 is a deficient number, since it is larger than the sum of its proper divisors (16975705094).

21205410130 is a wasteful number, since it uses less digits than its factorization.

21205410130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632061.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21205410130 its reverse (3101450212), we get a palindrome (24306860342).

The spelling of 21205410130 in words is "twenty-one billion, two hundred five million, four hundred ten thousand, one hundred thirty".