13121122021 has 8 divisors (see below), whose sum is σ = 15241397504. Its totient is φ = 11062303920.

The previous prime is 13121121989. The next prime is 13121122051. The reversal of 13121122021 is 12022112131.

13121122021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 13121122021 - 2⁵ = 13121121989 is a prime.

It is a super-2 number, since 2×13121122021² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13121121986 and 13121122004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121122051) 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 7 ways as a sum of consecutive naturals, for example, 15363885 + ... + 15364738.

It is an arithmetic number, because the mean of its divisors is an integer number (1905174688).

Almost surely, 2^13121122021 is an apocalyptic number.

It is an amenable number.

13121122021 is a deficient number, since it is larger than the sum of its proper divisors (2120275483).

13121122021 is an equidigital number, since it uses as much as digits as its factorization.

13121122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30728691.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 13121122021 its reverse (12022112131), we get a palindrome (25143234152).

The spelling of 13121122021 in words is "thirteen billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".