31231200121224 has 32 divisors (see below), whose sum is σ = 79401356244000. Its totient is φ = 10233952581632.

The previous prime is 31231200121223. The next prime is 31231200121259. The reversal of 31231200121224 is 42212100213213.

It is a super-2 number, since 2×31231200121224² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 31231200121194 and 31231200121203.

It is not an unprimeable number, because it can be changed into a prime (31231200121223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11027964729 + ... + 11027967560.

It is an arithmetic number, because the mean of its divisors is an integer number (2481292382625).

Almost surely, 2^{31231200121224} is an apocalyptic number.

It is an amenable number.

31231200121224 is an abundant number, since it is smaller than the sum of its proper divisors (48170156122776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31231200121224 is a wasteful number, since it uses less digits than its factorization.

31231200121224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22055932357 (or 22055932353 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 31231200121224 its reverse (42212100213213), we get a palindrome (73443300334437).

The spelling of 31231200121224 in words is "thirty-one trillion, two hundred thirty-one billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-four".