31221312212043 has 18 divisors (see below), whose sum is σ = 47906288753804. Its totient is φ = 19589842954944.

The previous prime is 31221312212029. The next prime is 31221312212107. The reversal of 31221312212043 is 34021221312213.

31221312212043 is a `hidden beast` number, since 3 + 1 + 221 + 312 + 2 + 120 + 4 + 3 = 666.

It is not a de Polignac number, because 31221312212043 - 2¹⁸ = 31221311949899 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31221312211998 and 31221312212016.

It is not an unprimeable number, because it can be changed into a prime (31221312232043) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6001787521 + ... + 6001792722.

Almost surely, 2^{31221312212043} is an apocalyptic number.

31221312212043 is a deficient number, since it is larger than the sum of its proper divisors (16684976541761).

31221312212043 is a wasteful number, since it uses less digits than its factorization.

31221312212043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12003580283 (or 12003580263 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 31221312212043 its reverse (34021221312213), we get a palindrome (65242533524256).

The spelling of 31221312212043 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred twelve million, two hundred twelve thousand, forty-three".