31021000232213 has 12 divisors (see below), whose sum is σ = 32428669591500. Its totient is φ = 29671996301376.

The previous prime is 31021000232203. The next prime is 31021000232291. The reversal of 31021000232213 is 31223200012013.

It can be written as a sum of positive squares in 2 ways, for example, as 30166710410929 + 854289821284 = 5492423^2 + 924278^2 .

It is not a de Polignac number, because 31021000232213 - 2¹⁰ = 31021000231189 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 (31021000232203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85810163 + ... + 86170911.

It is an arithmetic number, because the mean of its divisors is an integer number (2702389132625).

Almost surely, 2^{31021000232213} is an apocalyptic number.

It is an amenable number.

31021000232213 is a deficient number, since it is larger than the sum of its proper divisors (1407669359287).

31021000232213 is a wasteful number, since it uses less digits than its factorization.

31021000232213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523348 (or 523325 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31021000232213 its reverse (31223200012013), we get a palindrome (62244200244226).

The spelling of 31021000232213 in words is "thirty-one trillion, twenty-one billion, two hundred thirty-two thousand, two hundred thirteen".