21210120000002 has 4 divisors (see below), whose sum is σ = 31815180000006. Its totient is φ = 10605060000000.

The previous prime is 21210119999989. The next prime is 21210120000007. The reversal of 21210120000002 is 20000002101212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20429125379881 + 780994620121 = 4519859^2 + 883739^2 .

It is not an unprimeable number, because it can be changed into a prime (21210120000007) by changing a digit.

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 as a sum of consecutive naturals, namely, 5302529999999 + ... + 5302530000002.

Almost surely, 2^{21210120000002} is an apocalyptic number.

21210120000002 is a deficient number, since it is larger than the sum of its proper divisors (10605060000004).

21210120000002 is a wasteful number, since it uses less digits than its factorization.

21210120000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605060000003.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21210120000002 its reverse (20000002101212), we get a palindrome (41210122101214).

The spelling of 21210120000002 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, two", and thus it is an aban number.