21211012201 has 4 divisors (see below), whose sum is σ = 21728354004. Its totient is φ = 20693670400.

The previous prime is 21211012189. The next prime is 21211012243. The reversal of 21211012201 is 10221011212.

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 1018886400 + 20192125801 = 31920^2 + 142099^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211012201 - 2⁷ = 21211012073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21211012301) 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, 258670840 + ... + 258670921.

It is an arithmetic number, because the mean of its divisors is an integer number (5432088501).

Almost surely, 2^21211012201 is an apocalyptic number.

It is an amenable number.

21211012201 is a deficient number, since it is larger than the sum of its proper divisors (517341803).

21211012201 is an equidigital number, since it uses as much as digits as its factorization.

21211012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517341802.

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

Adding to 21211012201 its reverse (10221011212), we get a palindrome (31432023413).

The spelling of 21211012201 in words is "twenty-one billion, two hundred eleven million, twelve thousand, two hundred one".