31221234243 has 16 divisors (see below), whose sum is σ = 46260892800. Its totient is φ = 20810910600.

The previous prime is 31221234227. The next prime is 31221234251. The reversal of 31221234243 is 34243212213.

31221234243 is a `hidden beast` number, since 312 + 2 + 1 + 2 + 342 + 4 + 3 = 666.

It is not a de Polignac number, because 31221234243 - 2⁴ = 31221234227 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31221234943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92968 + ... + 266618.

It is an arithmetic number, because the mean of its divisors is an integer number (2891305800).

Almost surely, 2^31221234243 is an apocalyptic number.

31221234243 is a deficient number, since it is larger than the sum of its proper divisors (15039658557).

31221234243 is a wasteful number, since it uses less digits than its factorization.

31221234243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180319 (or 180313 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 31221234243 its reverse (34243212213), we get a palindrome (65464446456).

The spelling of 31221234243 in words is "thirty-one billion, two hundred twenty-one million, two hundred thirty-four thousand, two hundred forty-three".