21210232130 has 8 divisors (see below), whose sum is σ = 38178417852. Its totient is φ = 8484092848.

The previous prime is 21210232123. The next prime is 21210232151. The reversal of 21210232130 is 3123201212.

It can be written as a sum of positive squares in 2 ways, for example, as 19682125849 + 1528106281 = 140293^2 + 39091^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21210232099 and 21210232108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060511597 + ... + 1060511616.

Almost surely, 2^21210232130 is an apocalyptic number.

21210232130 is a deficient number, since it is larger than the sum of its proper divisors (16968185722).

21210232130 is a wasteful number, since it uses less digits than its factorization.

21210232130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121023220.

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

Adding to 21210232130 its reverse (3123201212), we get a palindrome (24333433342).

The spelling of 21210232130 in words is "twenty-one billion, two hundred ten million, two hundred thirty-two thousand, one hundred thirty".