21010121002 has 8 divisors (see below), whose sum is σ = 33939426276. Its totient is φ = 9696978912.

The previous prime is 21010120951. The next prime is 21010121137. The reversal of 21010121002 is 20012101012.

It can be written as a sum of positive squares in 2 ways, for example, as 20984709321 + 25411681 = 144861^2 + 5041^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21010121002.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404040763 + ... + 404040814.

Almost surely, 2^21010121002 is an apocalyptic number.

21010121002 is a deficient number, since it is larger than the sum of its proper divisors (12929305274).

21010121002 is a wasteful number, since it uses less digits than its factorization.

21010121002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808081592.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010121002 its reverse (20012101012), we get a palindrome (41022222014).

The spelling of 21010121002 in words is "twenty-one billion, ten million, one hundred twenty-one thousand, two".