31030213340 has 72 divisors (see below), whose sum is σ = 75848163552. Its totient is φ = 10632504960.

The previous prime is 31030213289. The next prime is 31030213343. The reversal of 31030213340 is 4331203013.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31030213343) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1785734 + ... + 1803026.

It is an arithmetic number, because the mean of its divisors is an integer number (1053446716).

Almost surely, 2^31030213340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31030213340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37924081776).

31030213340 is an abundant number, since it is smaller than the sum of its proper divisors (44817950212).

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

31030213340 is a wasteful number, since it uses less digits than its factorization.

31030213340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19147 (or 19138 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31030213340 its reverse (4331203013), we get a palindrome (35361416353).

The spelling of 31030213340 in words is "thirty-one billion, thirty million, two hundred thirteen thousand, three hundred forty".