221212323242 has 8 divisors (see below), whose sum is σ = 331825721796. Its totient is φ = 110603749312.

The previous prime is 221212323187. The next prime is 221212323253. The reversal of 221212323242 is 242323212122.

It can be written as a sum of positive squares in 2 ways, for example, as 212153281201 + 9059042041 = 460601^2 + 95179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089263 + ... + 1276290.

Almost surely, 2^221212323242 is an apocalyptic number.

221212323242 is a deficient number, since it is larger than the sum of its proper divisors (110613398554).

221212323242 is a wasteful number, since it uses less digits than its factorization.

221212323242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2412312.

The product of its digits is 4608, while the sum is 26.

Adding to 221212323242 its reverse (242323212122), we get a palindrome (463535535364).

The spelling of 221212323242 in words is "two hundred twenty-one billion, two hundred twelve million, three hundred twenty-three thousand, two hundred forty-two".