221212322132 has 24 divisors (see below), whose sum is σ = 400872468360. Its totient is φ = 106684986240.

The previous prime is 221212322119. The next prime is 221212322153. The reversal of 221212322132 is 231223212122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 29434892356 + 191777429776 = 171566^2 + 437924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221212322098 and 221212322107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840719 + ... + 1072022.

It is an arithmetic number, because the mean of its divisors is an integer number (16703019515).

Almost surely, 2^221212322132 is an apocalyptic number.

It is an amenable number.

221212322132 is a deficient number, since it is larger than the sum of its proper divisors (179660146228).

221212322132 is a wasteful number, since it uses less digits than its factorization.

221212322132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913771 (or 1913769 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

Adding to 221212322132 its reverse (231223212122), we get a palindrome (452435534254).

The spelling of 221212322132 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred twenty-two thousand, one hundred thirty-two".