21203212322 has 4 divisors (see below), whose sum is σ = 31804818486. Its totient is φ = 10601606160.

The previous prime is 21203212313. The next prime is 21203212357. The reversal of 21203212322 is 22321230212.

It is a happy number.

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., 10790846641 + 10412365681 = 103879^2 + 102041^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21203212294 and 21203212303.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300803079 + ... + 5300803082.

Almost surely, 2^21203212322 is an apocalyptic number.

21203212322 is a deficient number, since it is larger than the sum of its proper divisors (10601606164).

21203212322 is a wasteful number, since it uses less digits than its factorization.

21203212322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601606163.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21203212322 its reverse (22321230212), we get a palindrome (43524442534).

The spelling of 21203212322 in words is "twenty-one billion, two hundred three million, two hundred twelve thousand, three hundred twenty-two".