31212200100 has 36 divisors (see below), whose sum is σ = 90307299824. Its totient is φ = 8323253280.

The previous prime is 31212200029. The next prime is 31212200101. The reversal of 31212200100 is 100221213.

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 (31212200101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52020034 + ... + 52020633.

Almost surely, 2^31212200100 is an apocalyptic number.

31212200100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31212200100 is an abundant number, since it is smaller than the sum of its proper divisors (59095099724).

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

31212200100 is a wasteful number, since it uses less digits than its factorization.

31212200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104040684 (or 104040677 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 31212200100 its reverse (100221213), we get a palindrome (31312421313).

The spelling of 31212200100 in words is "thirty-one billion, two hundred twelve million, two hundred thousand, one hundred".