21102100201 has 16 divisors (see below), whose sum is σ = 25976656384. Its totient is φ = 16693055424.

The previous prime is 21102100189. The next prime is 21102100213. The reversal of 21102100201 is 10200120112.

It is an interprime number because it is at equal distance from previous prime (21102100189) and next prime (21102100213).

It is a cyclic number.

It is not a de Polignac number, because 21102100201 - 2¹³ = 21102092009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102100001) 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, 552736 + ... + 589678.

It is an arithmetic number, because the mean of its divisors is an integer number (1623541024).

Almost surely, 2^21102100201 is an apocalyptic number.

It is an amenable number.

21102100201 is a deficient number, since it is larger than the sum of its proper divisors (4874556183).

21102100201 is a wasteful number, since it uses less digits than its factorization.

21102100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43240.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21102100201 its reverse (10200120112), we get a palindrome (31302220313).

The spelling of 21102100201 in words is "twenty-one billion, one hundred two million, one hundred thousand, two hundred one".