21002000122 has 8 divisors (see below), whose sum is σ = 31521438900. Its totient is φ = 10494853824.

The previous prime is 21002000099. The next prime is 21002000147. The reversal of 21002000122 is 22100020012.

It can be written as a sum of positive squares in 2 ways, for example, as 20617800921 + 384199201 = 143589^2 + 19601^2 .

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 = 21002000099 and 21002000108.

It is an unprimeable number.

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, 3068847 + ... + 3075682.

Almost surely, 2^21002000122 is an apocalyptic number.

21002000122 is a deficient number, since it is larger than the sum of its proper divisors (10519438778).

21002000122 is a wasteful number, since it uses less digits than its factorization.

21002000122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6146240.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21002000122 its reverse (22100020012), we get a palindrome (43102020134).

The spelling of 21002000122 in words is "twenty-one billion, two million, one hundred twenty-two", and thus it is an aban number.