31011223213 has 4 divisors (see below), whose sum is σ = 31012709728. Its totient is φ = 31009736700.

The previous prime is 31011223171. The next prime is 31011223231. The reversal of 31011223213 is 31232211013.

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: 31232211013 = 401 ⋅77885813.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31011223213 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 (31011223913) 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, 711513 + ... + 753838.

It is an arithmetic number, because the mean of its divisors is an integer number (7753177432).

Almost surely, 2^31011223213 is an apocalyptic number.

It is an amenable number.

31011223213 is a deficient number, since it is larger than the sum of its proper divisors (1486515).

31011223213 is a wasteful number, since it uses less digits than its factorization.

31011223213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486514.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31011223213 its reverse (31232211013), we get a palindrome (62243434226).

The spelling of 31011223213 in words is "thirty-one billion, eleven million, two hundred twenty-three thousand, two hundred thirteen".