21203232122 has 4 divisors (see below), whose sum is σ = 31804848186. Its totient is φ = 10601616060.

The previous prime is 21203232121. The next prime is 21203232131. The reversal of 21203232122 is 22123230212.

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., 15690318121 + 5512914001 = 125261^2 + 74249^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21203232094 and 21203232103.

It is not an unprimeable number, because it can be changed into a prime (21203232121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5300808029 + ... + 5300808032.

Almost surely, 2^21203232122 is an apocalyptic number.

21203232122 is a deficient number, since it is larger than the sum of its proper divisors (10601616064).

21203232122 is a wasteful number, since it uses less digits than its factorization.

21203232122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10601616063.

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

Adding to 21203232122 its reverse (22123230212), we get a palindrome (43326462334).

The spelling of 21203232122 in words is "twenty-one billion, two hundred three million, two hundred thirty-two thousand, one hundred twenty-two".