13031211001021 has 4 divisors (see below), whose sum is σ = 13097359280412. Its totient is φ = 12965062721632.

The previous prime is 13031211000989. The next prime is 13031211001099. The reversal of 13031211001021 is 12010011213031.

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 11175047268100 + 1856163732921 = 3342910^2 + 1362411^2 .

It is a cyclic number.

It is not a de Polignac number, because 13031211001021 - 2⁵ = 13031211000989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031211000986 and 13031211001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031211061021) 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, 33074139400 + ... + 33074139793.

It is an arithmetic number, because the mean of its divisors is an integer number (3274339820103).

Almost surely, 2^{13031211001021} is an apocalyptic number.

It is an amenable number.

13031211001021 is a deficient number, since it is larger than the sum of its proper divisors (66148279391).

13031211001021 is an equidigital number, since it uses as much as digits as its factorization.

13031211001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66148279390.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 13031211001021 its reverse (12010011213031), we get a palindrome (25041222214052).

The spelling of 13031211001021 in words is "thirteen trillion, thirty-one billion, two hundred eleven million, one thousand, twenty-one".