31221132021213 has 8 divisors (see below), whose sum is σ = 41628404498400. Its totient is φ = 20813973779088.

The previous prime is 31221132021199. The next prime is 31221132021239. The reversal of 31221132021213 is 31212023112213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31221132021213 - 2⁴ = 31221132021197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221132021263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27919003 + ... + 29015736.

It is an arithmetic number, because the mean of its divisors is an integer number (5203550562300).

Almost surely, 2^{31221132021213} is an apocalyptic number.

It is an amenable number.

31221132021213 is a deficient number, since it is larger than the sum of its proper divisors (10407272477187).

31221132021213 is a wasteful number, since it uses less digits than its factorization.

31221132021213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57117531.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 31221132021213 its reverse (31212023112213), we get a palindrome (62433155133426).

The spelling of 31221132021213 in words is "thirty-one trillion, two hundred twenty-one billion, one hundred thirty-two million, twenty-one thousand, two hundred thirteen".