31030220100 has 216 divisors, whose sum is σ = 99122065504. Its totient is φ = 7489152000.

The previous prime is 31030220093. The next prime is 31030220107. The reversal of 31030220100 is 102203013.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31030220093) and next prime (31030220107).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (31030220107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8746527 + ... + 8750073.

Almost surely, 2^31030220100 is an apocalyptic number.

31030220100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31030220100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49561032752).

31030220100 is an abundant number, since it is smaller than the sum of its proper divisors (68091845404).

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

31030220100 is a wasteful number, since it uses less digits than its factorization.

31030220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3827 (or 3809 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 31030220100 its reverse (102203013), we get a palindrome (31132423113).

The spelling of 31030220100 in words is "thirty-one billion, thirty million, two hundred twenty thousand, one hundred".