20120122013 has 4 divisors (see below), whose sum is σ = 21303658620. Its totient is φ = 18936585408.

The previous prime is 20120121949. The next prime is 20120122021. The reversal of 20120122013 is 31022102102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31022102102 = 2 ⋅15511051051.

It can be written as a sum of positive squares in 2 ways, for example, as 8709182329 + 11410939684 = 93323^2 + 106822^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120122013 - 2⁶ = 20120121949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120122313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 591768278 + ... + 591768311.

It is an arithmetic number, because the mean of its divisors is an integer number (5325914655).

Almost surely, 2^20120122013 is an apocalyptic number.

It is an amenable number.

20120122013 is a deficient number, since it is larger than the sum of its proper divisors (1183536607).

20120122013 is a wasteful number, since it uses less digits than its factorization.

20120122013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183536606.

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

Adding to 20120122013 its reverse (31022102102), we get a palindrome (51142224115).

The spelling of 20120122013 in words is "twenty billion, one hundred twenty million, one hundred twenty-two thousand, thirteen".