21210110012101 has 4 divisors (see below), whose sum is σ = 21222833535072. Its totient is φ = 21197386489132.

The previous prime is 21210110012089. The next prime is 21210110012167. The reversal of 21210110012101 is 10121001101212.

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 not a de Polignac number, because 21210110012101 - 2⁷ = 21210110011973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210110012701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6361758985 + ... + 6361762318.

It is an arithmetic number, because the mean of its divisors is an integer number (5305708383768).

Almost surely, 2^{21210110012101} is an apocalyptic number.

It is an amenable number.

21210110012101 is a deficient number, since it is larger than the sum of its proper divisors (12723522971).

21210110012101 is a wasteful number, since it uses less digits than its factorization.

21210110012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12723522970.

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

Adding to 21210110012101 its reverse (10121001101212), we get a palindrome (31331111113313).

The spelling of 21210110012101 in words is "twenty-one trillion, two hundred ten billion, one hundred ten million, twelve thousand, one hundred one".