21212220130 has 16 divisors (see below), whose sum is σ = 38185410744. Its totient is φ = 8484129280.

The previous prime is 21212220119. The next prime is 21212220131. The reversal of 21212220130 is 3102221212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15725410801 + 5486809329 = 125401^2 + 74073^2 .

It is not an unprimeable number, because it can be changed into a prime (21212220131) 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, 30450 + ... + 208210.

Almost surely, 2^21212220130 is an apocalyptic number.

21212220130 is a deficient number, since it is larger than the sum of its proper divisors (16973190614).

21212220130 is a wasteful number, since it uses less digits than its factorization.

21212220130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189701.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21212220130 its reverse (3102221212), we get a palindrome (24314441342).

The spelling of 21212220130 in words is "twenty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred thirty".