40031021213 has 4 divisors (see below), whose sum is σ = 40031513340. Its totient is φ = 40030529088.

The previous prime is 40031021179. The next prime is 40031021221. The reversal of 40031021213 is 31212013004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11955672964 + 28075348249 = 109342^2 + 167557^2 .

It is a cyclic number.

It is not a de Polignac number, because 40031021213 - 2³⁴ = 22851152029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40031021191 and 40031021200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40031027213) 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, 91820 + ... + 297477.

It is an arithmetic number, because the mean of its divisors is an integer number (10007878335).

Almost surely, 2^40031021213 is an apocalyptic number.

It is an amenable number.

40031021213 is a deficient number, since it is larger than the sum of its proper divisors (492127).

40031021213 is a wasteful number, since it uses less digits than its factorization.

40031021213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492126.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 40031021213 its reverse (31212013004), we get a palindrome (71243034217).

The spelling of 40031021213 in words is "forty billion, thirty-one million, twenty-one thousand, two hundred thirteen".