21000211201 has 4 divisors (see below), whose sum is σ = 21186053892. Its totient is φ = 20814368512.

The previous prime is 21000211171. The next prime is 21000211207. The reversal of 21000211201 is 10211200012.

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 11594120976 + 9406090225 = 107676^2 + 96985^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000211201 - 2¹³ = 21000203009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000211207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92921176 + ... + 92921401.

It is an arithmetic number, because the mean of its divisors is an integer number (5296513473).

Almost surely, 2^21000211201 is an apocalyptic number.

It is an amenable number.

21000211201 is a deficient number, since it is larger than the sum of its proper divisors (185842691).

21000211201 is a wasteful number, since it uses less digits than its factorization.

21000211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185842690.

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

Adding to 21000211201 its reverse (10211200012), we get a palindrome (31211411213).

The spelling of 21000211201 in words is "twenty-one billion, two hundred eleven thousand, two hundred one".