31212103100220 has 288 divisors, whose sum is σ = 111834171915648. Its totient is φ = 6897164691456.

The previous prime is 31212103100209. The next prime is 31212103100237. The reversal of 31212103100220 is 2200130121213.

31212103100220 is a `hidden beast` number, since 3 + 12 + 121 + 0 + 310 + 0 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31212103100193 and 31212103100202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5187174 + ... + 9451506.

Almost surely, 2^{31212103100220} is an apocalyptic number.

31212103100220 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 31212103100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55917085957824).

31212103100220 is an abundant number, since it is smaller than the sum of its proper divisors (80622068815428).

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

31212103100220 is a wasteful number, since it uses less digits than its factorization.

31212103100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264549 (or 4264544 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31212103100220 its reverse (2200130121213), we get a palindrome (33412233221433).

The spelling of 31212103100220 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred thousand, two hundred twenty".