4312051021 has 4 divisors (see below), whose sum is σ = 4382740444. Its totient is φ = 4241361600.

The previous prime is 4312051013. The next prime is 4312051031. The reversal of 4312051021 is 1201502134.

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 1740141225 + 2571909796 = 41715^2 + 50714^2 .

It is a cyclic number.

It is not a de Polignac number, because 4312051021 - 2³ = 4312051013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4312051021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4312051031) 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, 35344620 + ... + 35344741.

It is an arithmetic number, because the mean of its divisors is an integer number (1095685111).

Almost surely, 2^4312051021 is an apocalyptic number.

It is an amenable number.

4312051021 is a deficient number, since it is larger than the sum of its proper divisors (70689423).

4312051021 is an equidigital number, since it uses as much as digits as its factorization.

4312051021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70689422.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 4312051021 is about 65666.2091261556. The cubic root of 4312051021 is about 1627.6510284627.

Adding to 4312051021 its reverse (1201502134), we get a palindrome (5513553155).

The spelling of 4312051021 in words is "four billion, three hundred twelve million, fifty-one thousand, twenty-one".