21210020100201 has 16 divisors (see below), whose sum is σ = 30075340500800. Its totient is φ = 13257701111808.

The previous prime is 21210020100151. The next prime is 21210020100289. The reversal of 21210020100201 is 10200102001212.

It is not a de Polignac number, because 21210020100201 - 2¹¹ = 21210020098153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210020105201) 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, 1918064656 + ... + 1918075713.

It is an arithmetic number, because the mean of its divisors is an integer number (1879708781300).

Almost surely, 2^{21210020100201} is an apocalyptic number.

It is an amenable number.

21210020100201 is a deficient number, since it is larger than the sum of its proper divisors (8865320400599).

21210020100201 is a wasteful number, since it uses less digits than its factorization.

21210020100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3836140488.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21210020100201 its reverse (10200102001212), we get a palindrome (31410122101413).

The spelling of 21210020100201 in words is "twenty-one trillion, two hundred ten billion, twenty million, one hundred thousand, two hundred one".