31223101213100 has 144 divisors (see below), whose sum is σ = 71224081367040. Its totient is φ = 11857940371200.

The previous prime is 31223101213093. The next prime is 31223101213111. The reversal of 31223101213100 is 131210132213.

It is a happy number.

It is a super-2 number, since 2×31223101213100² (a number of 28 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 203319146 + ... + 203472654.

It is an arithmetic number, because the mean of its divisors is an integer number (494611676160).

Almost surely, 2^{31223101213100} 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 31223101213100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35612040683520).

31223101213100 is an abundant number, since it is smaller than the sum of its proper divisors (40000980153940).

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

31223101213100 is a wasteful number, since it uses less digits than its factorization.

31223101213100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154200 (or 154193 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31223101213100 its reverse (131210132213), we get a palindrome (31354311345313).

The spelling of 31223101213100 in words is "thirty-one trillion, two hundred twenty-three billion, one hundred one million, two hundred thirteen thousand, one hundred".