21031303122 has 24 divisors (see below), whose sum is σ = 45573156876. Its totient is φ = 7009613856.

The previous prime is 21031303099. The next prime is 21031303147. The reversal of 21031303122 is 22130313012.

21031303122 is a `hidden beast` number, since 210 + 31 + 303 + 122 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14833047681 + 6198255441 = 121791^2 + 78729^2 .

It is a super-2 number, since 2×21031303122² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21031303095 and 21031303104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101028 + ... + 228624.

Almost surely, 2^21031303122 is an apocalyptic number.

21031303122 is an abundant number, since it is smaller than the sum of its proper divisors (24541853754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21031303122 is a wasteful number, since it uses less digits than its factorization.

21031303122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136762 (or 136759 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21031303122 its reverse (22130313012), we get a palindrome (43161616134).

The spelling of 21031303122 in words is "twenty-one billion, thirty-one million, three hundred three thousand, one hundred twenty-two".