31440402213 has 32 divisors (see below), whose sum is σ = 47639961600. Its totient is φ = 18270878400.

The previous prime is 31440402199. The next prime is 31440402277. The reversal of 31440402213 is 31220404413.

It is not a de Polignac number, because 31440402213 - 2⁴ = 31440402197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31440402613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29473 + ... + 252486.

It is an arithmetic number, because the mean of its divisors is an integer number (1488748800).

Almost surely, 2^31440402213 is an apocalyptic number.

31440402213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31440402213 is a deficient number, since it is larger than the sum of its proper divisors (16199559387).

31440402213 is a wasteful number, since it uses less digits than its factorization.

31440402213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282113.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31440402213 its reverse (31220404413), we get a palindrome (62660806626).

The spelling of 31440402213 in words is "thirty-one billion, four hundred forty million, four hundred two thousand, two hundred thirteen".