20121223130 has 32 divisors (see below), whose sum is σ = 36707576976. Its totient is φ = 7940265984.

The previous prime is 20121223123. The next prime is 20121223153. The reversal of 20121223130 is 3132212102.

It can be written as a sum of positive squares in 8 ways, for example, as 2320059889 + 17801163241 = 48167^2 + 133421^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20121223099 and 20121223108.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 274772 + ... + 340208.

Almost surely, 2^20121223130 is an apocalyptic number.

20121223130 is a deficient number, since it is larger than the sum of its proper divisors (16586353846).

20121223130 is a wasteful number, since it uses less digits than its factorization.

20121223130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65858.

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

Adding to 20121223130 its reverse (3132212102), we get a palindrome (23253435232).

The spelling of 20121223130 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred thirty".