21203030122 has 8 divisors (see below), whose sum is σ = 33675400836. Its totient is φ = 9977896512.

The previous prime is 21203030099. The next prime is 21203030129. The reversal of 21203030122 is 22103030212.

It can be written as a sum of positive squares in 2 ways, for example, as 20237623081 + 965407041 = 142259^2 + 31071^2 .

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 = 21203030096 and 21203030105.

It is not an unprimeable number, because it can be changed into a prime (21203030129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311809233 + ... + 311809300.

Almost surely, 2^21203030122 is an apocalyptic number.

21203030122 is a deficient number, since it is larger than the sum of its proper divisors (12472370714).

21203030122 is a wasteful number, since it uses less digits than its factorization.

21203030122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623618552.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21203030122 its reverse (22103030212), we get a palindrome (43306060334).

The spelling of 21203030122 in words is "twenty-one billion, two hundred three million, thirty thousand, one hundred twenty-two".