20120312212 has 144 divisors (see below), whose sum is σ = 48116105856. Its totient is φ = 7162848000.

The previous prime is 20120312167. The next prime is 20120312231. The reversal of 20120312212 is 21221302102.

It is a happy number.

It is a super-3 number, since 3×20120312212³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 4446183 + ... + 4450705.

It is an arithmetic number, because the mean of its divisors is an integer number (334139624).

Almost surely, 2^20120312212 is an apocalyptic number.

20120312212 is a gapful number since it is divisible by the number (22) 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 20120312212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24058052928).

20120312212 is an abundant number, since it is smaller than the sum of its proper divisors (27995793644).

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

20120312212 is a wasteful number, since it uses less digits than its factorization.

20120312212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670 (or 4657 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20120312212 its reverse (21221302102), we get a palindrome (41341614314).

The spelling of 20120312212 in words is "twenty billion, one hundred twenty million, three hundred twelve thousand, two hundred twelve".