4131090021 has 4 divisors (see below), whose sum is σ = 5508120032. Its totient is φ = 2754060012.

The previous prime is 4131090017. The next prime is 4131090031. The reversal of 4131090021 is 1200901314.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4131090021 - 2² = 4131090017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4131090021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4131090001) 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, 688515001 + ... + 688515006.

It is an arithmetic number, because the mean of its divisors is an integer number (1377030008).

Almost surely, 2^4131090021 is an apocalyptic number.

It is an amenable number.

4131090021 is a deficient number, since it is larger than the sum of its proper divisors (1377030011).

4131090021 is a wasteful number, since it uses less digits than its factorization.

4131090021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377030010.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 4131090021 is about 64273.5561564785. The cubic root of 4131090021 is about 1604.5560274706.

Adding to 4131090021 its reverse (1200901314), we get a palindrome (5331991335).

The spelling of 4131090021 in words is "four billion, one hundred thirty-one million, ninety thousand, twenty-one".