21010002121201 has 4 divisors (see below), whose sum is σ = 21038901712192. Its totient is φ = 20981102530212.

The previous prime is 21010002121123. The next prime is 21010002121247. The reversal of 21010002121201 is 10212120001012.

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 21010002121201 - 2⁹ = 21010002120689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010002128201) 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, 14449794405 + ... + 14449795858.

It is an arithmetic number, because the mean of its divisors is an integer number (5259725428048).

Almost surely, 2^{21010002121201} is an apocalyptic number.

It is an amenable number.

21010002121201 is a deficient number, since it is larger than the sum of its proper divisors (28899590991).

21010002121201 is an equidigital number, since it uses as much as digits as its factorization.

21010002121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28899590990.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21010002121201 its reverse (10212120001012), we get a palindrome (31222122122213).

The spelling of 21010002121201 in words is "twenty-one trillion, ten billion, two million, one hundred twenty-one thousand, two hundred one".