31224040000 has 70 divisors (see below), whose sum is σ = 77425570574. Its totient is φ = 12489600000.

The previous prime is 31224039997. The next prime is 31224040021. The reversal of 31224040000 is 4042213.

It can be written as a sum of positive squares in 5 ways, for example, as 5060330496 + 26163709504 = 71136^2 + 161752^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 350301 + ... + 430300.

Almost surely, 2^31224040000 is an apocalyptic number.

It is an amenable number.

31224040000 is an abundant number, since it is smaller than the sum of its proper divisors (46201530574).

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

31224040000 is an frugal number, since it uses more digits than its factorization.

31224040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780633 (or 780608 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 31224040000 its reverse (4042213), we get a palindrome (31228082213).

The spelling of 31224040000 in words is "thirty-one billion, two hundred twenty-four million, forty thousand".