221022222012 has 144 divisors (see below), whose sum is σ = 573519229920. Its totient is φ = 71742528000.

The previous prime is 221022221989. The next prime is 221022222061. The reversal of 221022222012 is 210222220122.

221022222012 is a `hidden beast` number, since 2 + 210 + 222 + 220 + 12 = 666.

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

It is a congruent number.

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, 169885762 + ... + 169887062.

It is an arithmetic number, because the mean of its divisors is an integer number (3982772430).

Almost surely, 2^221022222012 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 221022222012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286759614960).

221022222012 is an abundant number, since it is smaller than the sum of its proper divisors (352497007908).

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

221022222012 is a wasteful number, since it uses less digits than its factorization.

221022222012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964 (or 1959 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221022222012 its reverse (210222220122), we get a palindrome (431244442134).

It can be divided in two parts, 2 and 21022222012, that multiplied together give a palindrome (42044444024).

The spelling of 221022222012 in words is "two hundred twenty-one billion, twenty-two million, two hundred twenty-two thousand, twelve".