2031401241521 has 4 divisors (see below), whose sum is σ = 2031441844212. Its totient is φ = 2031360638832.

The previous prime is 2031401241487. The next prime is 2031401241547. The reversal of 2031401241521 is 1251421041302.

It is a happy number.

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 817823600896 + 1213577640625 = 904336^2 + 1101625^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2031401241521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2031401241581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20226206 + ... + 20326391.

It is an arithmetic number, because the mean of its divisors is an integer number (507860461053).

Almost surely, 2^{2031401241521} is an apocalyptic number.

It is an amenable number.

2031401241521 is a deficient number, since it is larger than the sum of its proper divisors (40602691).

2031401241521 is an equidigital number, since it uses as much as digits as its factorization.

2031401241521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40602690.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 2031401241521 its reverse (1251421041302), we get a palindrome (3282822282823).

The spelling of 2031401241521 in words is "two trillion, thirty-one billion, four hundred one million, two hundred forty-one thousand, five hundred twenty-one".