31211321023 has 4 divisors (see below), whose sum is σ = 31503015720. Its totient is φ = 30919626328.

The previous prime is 31211320993. The next prime is 31211321059. The reversal of 31211321023 is 32012311213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32012311213 = 3347 ⋅9564479.

It is a cyclic number.

It is not a de Polignac number, because 31211321023 - 2¹³ = 31211312831 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 (31211321093) 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, 145847188 + ... + 145847401.

It is an arithmetic number, because the mean of its divisors is an integer number (7875753930).

Almost surely, 2^31211321023 is an apocalyptic number.

31211321023 is a deficient number, since it is larger than the sum of its proper divisors (291694697).

31211321023 is a wasteful number, since it uses less digits than its factorization.

31211321023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291694696.

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

Adding to 31211321023 its reverse (32012311213), we get a palindrome (63223632236).

The spelling of 31211321023 in words is "thirty-one billion, two hundred eleven million, three hundred twenty-one thousand, twenty-three".