13031222021 has 4 divisors (see below), whose sum is σ = 13308482112. Its totient is φ = 12753961932.

The previous prime is 13031221943. The next prime is 13031222023. The reversal of 13031222021 is 12022213031.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12022213031 = 647 ⋅18581473.

It is a cyclic number.

It is not a de Polignac number, because 13031222021 - 2¹⁴ = 13031205637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031222023) 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, 138629975 + ... + 138630068.

It is an arithmetic number, because the mean of its divisors is an integer number (3327120528).

Almost surely, 2^13031222021 is an apocalyptic number.

It is an amenable number.

13031222021 is a deficient number, since it is larger than the sum of its proper divisors (277260091).

13031222021 is an equidigital number, since it uses as much as digits as its factorization.

13031222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277260090.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 13031222021 its reverse (12022213031), we get a palindrome (25053435052).

The spelling of 13031222021 in words is "thirteen billion, thirty-one million, two hundred twenty-two thousand, twenty-one".