212221606442 has 4 divisors (see below), whose sum is σ = 318332409666. Its totient is φ = 106110803220.

The previous prime is 212221606423. The next prime is 212221606447. The reversal of 212221606442 is 244606122212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 163257210601 + 48964395841 = 404051^2 + 221279^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212221606399 and 212221606408.

It is not an unprimeable number, because it can be changed into a prime (212221606447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53055401609 + ... + 53055401612.

Almost surely, 2^212221606442 is an apocalyptic number.

212221606442 is a deficient number, since it is larger than the sum of its proper divisors (106110803224).

212221606442 is a wasteful number, since it uses less digits than its factorization.

212221606442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106110803223.

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 212221606442 its reverse (244606122212), we get a palindrome (456827728654).

The spelling of 212221606442 in words is "two hundred twelve billion, two hundred twenty-one million, six hundred six thousand, four hundred forty-two".