21100010201 has 4 divisors (see below), whose sum is σ = 21254025012. Its totient is φ = 20945995392.

The previous prime is 21100010177. The next prime is 21100010213. The reversal of 21100010201 is 10201000112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13491984025 + 7608026176 = 116155^2 + 87224^2 .

It is a cyclic number.

It is not a de Polignac number, because 21100010201 - 2⁶ = 21100010137 is a prime.

It is a super-3 number, since 3×21100010201³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100010231) 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, 77007200 + ... + 77007473.

It is an arithmetic number, because the mean of its divisors is an integer number (5313506253).

Almost surely, 2^21100010201 is an apocalyptic number.

It is an amenable number.

21100010201 is a deficient number, since it is larger than the sum of its proper divisors (154014811).

21100010201 is a wasteful number, since it uses less digits than its factorization.

21100010201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154014810.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21100010201 its reverse (10201000112), we get a palindrome (31301010313).

The spelling of 21100010201 in words is "twenty-one billion, one hundred million, ten thousand, two hundred one".