21221232122 has 8 divisors (see below), whose sum is σ = 31833168372. Its totient is φ = 10610176000.

The previous prime is 21221232121. The next prime is 21221232139. The reversal of 21221232122 is 22123212212.

It can be written as a sum of positive squares in 2 ways, for example, as 14182189921 + 7039042201 = 119089^2 + 83899^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21221232094 and 21221232103.

It is not an unprimeable number, because it can be changed into a prime (21221232121) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 156029 + ... + 258432.

Almost surely, 2^21221232122 is an apocalyptic number.

21221232122 is a deficient number, since it is larger than the sum of its proper divisors (10611936250).

21221232122 is a wasteful number, since it uses less digits than its factorization.

21221232122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440064.

The product of its digits is 384, while the sum is 20.

Adding to 21221232122 its reverse (22123212212), we get a palindrome (43344444334).

The spelling of 21221232122 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty-two thousand, one hundred twenty-two".