21210111322 has 4 divisors (see below), whose sum is σ = 31815166986. Its totient is φ = 10605055660.

The previous prime is 21210111311. The next prime is 21210111337. The reversal of 21210111322 is 22311101212.

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., 14510852521 + 6699258801 = 120461^2 + 81849^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21210111296 and 21210111305.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302527829 + ... + 5302527832.

Almost surely, 2^21210111322 is an apocalyptic number.

21210111322 is a deficient number, since it is larger than the sum of its proper divisors (10605055664).

21210111322 is a wasteful number, since it uses less digits than its factorization.

21210111322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605055663.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21210111322 its reverse (22311101212), we get a palindrome (43521212534).

The spelling of 21210111322 in words is "twenty-one billion, two hundred ten million, one hundred eleven thousand, three hundred twenty-two".