221212322012 has 96 divisors (see below), whose sum is σ = 448149542400. Its totient is φ = 94560435200.

The previous prime is 221212322011. The next prime is 221212322033. The reversal of 221212322012 is 210223212122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212322011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16115312 + ... + 16129032.

It is an arithmetic number, because the mean of its divisors is an integer number (4668224400).

Almost surely, 2^221212322012 is an apocalyptic number.

221212322012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221212322012 is an abundant number, since it is smaller than the sum of its proper divisors (226937220388).

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

221212322012 is a wasteful number, since it uses less digits than its factorization.

221212322012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14027 (or 14025 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221212322012 its reverse (210223212122), we get a palindrome (431435534134).

The spelling of 221212322012 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred twenty-two thousand, twelve".