3121220223031 has 4 divisors (see below), whose sum is σ = 3121384077064. Its totient is φ = 3121056369000.

The previous prime is 3121220223029. The next prime is 3121220223067. The reversal of 3121220223031 is 1303220221213.

3121220223031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3121220223031 - 2¹ = 3121220223029 is a prime.

It is a super-2 number, since 2×3121220223031² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3121220222993 and 3121220223011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121220223091) 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, 81898440 + ... + 81936541.

It is an arithmetic number, because the mean of its divisors is an integer number (780346019266).

Almost surely, 2^{3121220223031} is an apocalyptic number.

3121220223031 is a deficient number, since it is larger than the sum of its proper divisors (163854033).

3121220223031 is a wasteful number, since it uses less digits than its factorization.

3121220223031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163854032.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 3121220223031 its reverse (1303220221213), we get a palindrome (4424440444244).

The spelling of 3121220223031 in words is "three trillion, one hundred twenty-one billion, two hundred twenty million, two hundred twenty-three thousand, thirty-one".