21210010012101 has 4 divisors (see below), whose sum is σ = 28280013349472. Its totient is φ = 14140006674732.

The previous prime is 21210010012063. The next prime is 21210010012127. The reversal of 21210010012101 is 10121001001212.

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 not a de Polignac number, because 21210010012101 - 2¹³ = 21210010003909 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 (21210010012181) 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, 3535001668681 + ... + 3535001668686.

It is an arithmetic number, because the mean of its divisors is an integer number (7070003337368).

Almost surely, 2^{21210010012101} is an apocalyptic number.

It is an amenable number.

21210010012101 is a deficient number, since it is larger than the sum of its proper divisors (7070003337371).

21210010012101 is an equidigital number, since it uses as much as digits as its factorization.

21210010012101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070003337370.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21210010012101 its reverse (10121001001212), we get a palindrome (31331011013313).

The spelling of 21210010012101 in words is "twenty-one trillion, two hundred ten billion, ten million, twelve thousand, one hundred one".