21210120000001 has 4 divisors (see below), whose sum is σ = 21210311277504. Its totient is φ = 21209928722500.

The previous prime is 21210119999989. The next prime is 21210120000007. The reversal of 21210120000001 is 10000002101212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21210120000001 - 2⁵ = 21210119999969 is a prime.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 95472325 + ... + 95694226.

It is an arithmetic number, because the mean of its divisors is an integer number (5302577819376).

Almost surely, 2^{21210120000001} is an apocalyptic number.

It is an amenable number.

21210120000001 is a deficient number, since it is larger than the sum of its proper divisors (191277503).

21210120000001 is a wasteful number, since it uses less digits than its factorization.

21210120000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191277502.

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

Adding to 21210120000001 its reverse (10000002101212), we get a palindrome (31210122101213).

The spelling of 21210120000001 in words is "twenty-one trillion, two hundred ten billion, one hundred twenty million, one", and thus it is an aban number.