21202012130 has 16 divisors (see below), whose sum is σ = 41099285304. Its totient is φ = 7828435200.

The previous prime is 21202012129. The next prime is 21202012147. The reversal of 21202012130 is 3121020212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17716408609 + 3485603521 = 133103^2 + 59039^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81546071 + ... + 81546330.

Almost surely, 2^21202012130 is an apocalyptic number.

21202012130 is a deficient number, since it is larger than the sum of its proper divisors (19897273174).

21202012130 is a wasteful number, since it uses less digits than its factorization.

21202012130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163092421.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21202012130 its reverse (3121020212), we get a palindrome (24323032342).

The spelling of 21202012130 in words is "twenty-one billion, two hundred two million, twelve thousand, one hundred thirty".