12021021013 has 4 divisors (see below), whose sum is σ = 12021721740. Its totient is φ = 12020320288.

The previous prime is 12021021007. The next prime is 12021021031. The reversal of 12021021013 is 31012012021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 386594244 + 11634426769 = 19662^2 + 107863^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021021013 - 2¹³ = 12021012821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021020984 and 12021021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021021713) 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, 323968 + ... + 359161.

It is an arithmetic number, because the mean of its divisors is an integer number (3005430435).

Almost surely, 2^12021021013 is an apocalyptic number.

It is an amenable number.

12021021013 is a deficient number, since it is larger than the sum of its proper divisors (700727).

12021021013 is an equidigital number, since it uses as much as digits as its factorization.

12021021013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700726.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 12021021013 its reverse (31012012021), we get a palindrome (43033033034).

The spelling of 12021021013 in words is "twelve billion, twenty-one million, twenty-one thousand, thirteen".