31020212213 has 4 divisors (see below), whose sum is σ = 31104736320. Its totient is φ = 30935688108.

The previous prime is 31020212207. The next prime is 31020212233. The reversal of 31020212213 is 31221202013.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020212213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31020212191 and 31020212200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31020212233) 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, 42261503 + ... + 42262236.

It is an arithmetic number, because the mean of its divisors is an integer number (7776184080).

Almost surely, 2^31020212213 is an apocalyptic number.

It is an amenable number.

31020212213 is a deficient number, since it is larger than the sum of its proper divisors (84524107).

31020212213 is an equidigital number, since it uses as much as digits as its factorization.

31020212213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84524106.

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

Adding to 31020212213 its reverse (31221202013), we get a palindrome (62241414226).

The spelling of 31020212213 in words is "thirty-one billion, twenty million, two hundred twelve thousand, two hundred thirteen".