21210012110101 has 4 divisors (see below), whose sum is σ = 21508744675104. Its totient is φ = 20911279545100.

The previous prime is 21210012110083. The next prime is 21210012110141. The reversal of 21210012110101 is 10101121001212.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-21210012110101 is a prime.

It is a super-2 number, since 2×21210012110101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210012110141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149366282395 + ... + 149366282536.

It is an arithmetic number, because the mean of its divisors is an integer number (5377186168776).

Almost surely, 2^{21210012110101} is an apocalyptic number.

It is an amenable number.

21210012110101 is a deficient number, since it is larger than the sum of its proper divisors (298732565003).

21210012110101 is an equidigital number, since it uses as much as digits as its factorization.

21210012110101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298732565002.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21210012110101 its reverse (10101121001212), we get a palindrome (31311133111313).

The spelling of 21210012110101 in words is "twenty-one trillion, two hundred ten billion, twelve million, one hundred ten thousand, one hundred one".