21031222130 has 16 divisors (see below), whose sum is σ = 38191212504. Its totient is φ = 8338041600.

The previous prime is 21031222111. The next prime is 21031222141. The reversal of 21031222130 is 3122213012.

It can be written as a sum of positive squares in 4 ways, for example, as 13759055401 + 7272166729 = 117299^2 + 85277^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21031222099 and 21031222108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9304721 + ... + 9306980.

Almost surely, 2^21031222130 is an apocalyptic number.

21031222130 is a deficient number, since it is larger than the sum of its proper divisors (17159990374).

21031222130 is a wasteful number, since it uses less digits than its factorization.

21031222130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18611821.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21031222130 its reverse (3122213012), we get a palindrome (24153435142).

The spelling of 21031222130 in words is "twenty-one billion, thirty-one million, two hundred twenty-two thousand, one hundred thirty".