21130402130 has 32 divisors (see below), whose sum is σ = 38219468976. Its totient is φ = 8411203584.

The previous prime is 21130402123. The next prime is 21130402133. The reversal of 21130402130 is 3120403112.

It can be written as a sum of positive squares in 8 ways, for example, as 5695569961 + 15434832169 = 75469^2 + 124237^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21130402099 and 21130402108.

It is not an unprimeable number, because it can be changed into a prime (21130402133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1871462 + ... + 1882718.

Almost surely, 2^21130402130 is an apocalyptic number.

21130402130 is a deficient number, since it is larger than the sum of its proper divisors (17089066846).

21130402130 is a wasteful number, since it uses less digits than its factorization.

21130402130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12158.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21130402130 its reverse (3120403112), we get a palindrome (24250805242).

The spelling of 21130402130 in words is "twenty-one billion, one hundred thirty million, four hundred two thousand, one hundred thirty".