31212111200000 has 216 divisors, whose sum is σ = 78969835919520. Its totient is φ = 12308979200000.

The previous prime is 31212111199999. The next prime is 31212111200047. The reversal of 31212111200000 is 211121213.

It is a super-2 number, since 2×31212111200000² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56525246 + ... + 57074754.

It is an arithmetic number, because the mean of its divisors is an integer number (365601092220).

Almost surely, 2^{31212111200000} 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 31212111200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39484917959760).

31212111200000 is an abundant number, since it is smaller than the sum of its proper divisors (47757724719520).

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

31212111200000 is an frugal number, since it uses more digits than its factorization.

31212111200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549621 (or 549587 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 31212111200000 its reverse (211121213), we get a palindrome (31212322321213).

The spelling of 31212111200000 in words is "thirty-one trillion, two hundred twelve billion, one hundred eleven million, two hundred thousand".