31240020443213 has 16 divisors (see below), whose sum is σ = 31792374921216. Its totient is φ = 30690214632000.

The previous prime is 31240020443209. The next prime is 31240020443231. The reversal of 31240020443213 is 31234402004213.

It is a cyclic number.

It is not a de Polignac number, because 31240020443213 - 2² = 31240020443209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240020443293) 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, 269408195 + ... + 269524127.

It is an arithmetic number, because the mean of its divisors is an integer number (1987023432576).

Almost surely, 2^{31240020443213} is an apocalyptic number.

It is an amenable number.

31240020443213 is a deficient number, since it is larger than the sum of its proper divisors (552354478003).

31240020443213 is a wasteful number, since it uses less digits than its factorization.

31240020443213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126884.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 31240020443213 its reverse (31234402004213), we get a palindrome (62474422447426).

The spelling of 31240020443213 in words is "thirty-one trillion, two hundred forty billion, twenty million, four hundred forty-three thousand, two hundred thirteen".