21002100121201 has 16 divisors (see below), whose sum is σ = 21227738133888. Its totient is φ = 20777466528000.

The previous prime is 21002100121181. The next prime is 21002100121241. The reversal of 21002100121201 is 10212100120012.

It is a cyclic number.

It is not a de Polignac number, because 21002100121201 - 2¹³ = 21002100113009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002100121241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 454735156 + ... + 454781338.

It is an arithmetic number, because the mean of its divisors is an integer number (1326733633368).

Almost surely, 2^{21002100121201} is an apocalyptic number.

It is an amenable number.

21002100121201 is a deficient number, since it is larger than the sum of its proper divisors (225638012687).

21002100121201 is a wasteful number, since it uses less digits than its factorization.

21002100121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56952.

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

Adding to 21002100121201 its reverse (10212100120012), we get a palindrome (31214200241213).

The spelling of 21002100121201 in words is "twenty-one trillion, two billion, one hundred million, one hundred twenty-one thousand, two hundred one".