20121130 has 8 divisors (see below), whose sum is σ = 36218052. Its totient is φ = 8048448.

The previous prime is 20121121. The next prime is 20121137. The reversal of 20121130 is 3112102.

It can be written as a sum of positive squares in 2 ways, for example, as 19123129 + 998001 = 4373^2 + 999^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (10), and also a Moran number because the ratio is a prime number: 2012113 = 20121130 / (2 + 0 + 1 + 2 + 1 + 1 + 3 + 0).

It is not an unprimeable number, because it can be changed into a prime (20121137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1006047 + ... + 1006066.

Almost surely, 2^20121130 is an apocalyptic number.

20121130 is a deficient number, since it is larger than the sum of its proper divisors (16096922).

20121130 is a wasteful number, since it uses less digits than its factorization.

20121130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2012120.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 20121130 is about 4485.6582571569. The cubic root of 20121130 is about 271.9886547315.

Adding to 20121130 its reverse (3112102), we get a palindrome (23233232).

Subtracting from 20121130 its reverse (3112102), we obtain a triangular number (17009028 = T₅₈₃₂).

The spelling of 20121130 in words is "twenty million, one hundred twenty-one thousand, one hundred thirty".