10120312021 has 4 divisors (see below), whose sum is σ = 10126587852. Its totient is φ = 10114036192.

The previous prime is 10120311997. The next prime is 10120312031. The reversal of 10120312021 is 12021302101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12021302101 = 229 ⋅52494769.

It can be written as a sum of positive squares in 2 ways, for example, as 7949683921 + 2170628100 = 89161^2 + 46590^2 .

It is a cyclic number.

It is not a de Polignac number, because 10120312021 - 2¹¹ = 10120309973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10120311992 and 10120312010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10120312031) 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, 3135496 + ... + 3138721.

It is an arithmetic number, because the mean of its divisors is an integer number (2531646963).

Almost surely, 2^10120312021 is an apocalyptic number.

It is an amenable number.

10120312021 is a deficient number, since it is larger than the sum of its proper divisors (6275831).

10120312021 is an equidigital number, since it uses as much as digits as its factorization.

10120312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6275830.

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

Adding to 10120312021 its reverse (12021302101), we get a palindrome (22141614122).

The spelling of 10120312021 in words is "ten billion, one hundred twenty million, three hundred twelve thousand, twenty-one".