21013232122 has 4 divisors (see below), whose sum is σ = 31519848186. Its totient is φ = 10506616060.

The previous prime is 21013232111. The next prime is 21013232159. The reversal of 21013232122 is 22123231012.

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., 18963768681 + 2049463441 = 137709^2 + 45271^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21013232122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253308029 + ... + 5253308032.

Almost surely, 2^21013232122 is an apocalyptic number.

21013232122 is a deficient number, since it is larger than the sum of its proper divisors (10506616064).

21013232122 is a wasteful number, since it uses less digits than its factorization.

21013232122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10506616063.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21013232122 its reverse (22123231012), we get a palindrome (43136463134).

The spelling of 21013232122 in words is "twenty-one billion, thirteen million, two hundred thirty-two thousand, one hundred twenty-two".