2021123013 has 64 divisors (see below), whose sum is σ = 3633154560. Its totient is φ = 968712192.

The previous prime is 2021123009. The next prime is 2021123029. The reversal of 2021123013 is 3103211202.

It is not a de Polignac number, because 2021123013 - 2² = 2021123009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2021122983 and 2021123001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021123053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 127081 + ... + 142097.

It is an arithmetic number, because the mean of its divisors is an integer number (56768040).

Almost surely, 2^2021123013 is an apocalyptic number.

It is an amenable number.

2021123013 is a deficient number, since it is larger than the sum of its proper divisors (1612031547).

2021123013 is a wasteful number, since it uses less digits than its factorization.

2021123013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15086.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2021123013 is about 44956.9017282108. The cubic root of 2021123013 is about 1264.3410802838.

Adding to 2021123013 its reverse (3103211202), we get a palindrome (5124334215).

The spelling of 2021123013 in words is "two billion, twenty-one million, one hundred twenty-three thousand, thirteen".