21311011201 has 4 divisors (see below), whose sum is σ = 21830792004. Its totient is φ = 20791230400.

The previous prime is 21311011187. The next prime is 21311011223. The reversal of 21311011201 is 10211011312.

It is a happy number.

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 9960239601 + 11350771600 = 99801^2 + 106540^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311011201 - 2¹⁵ = 21310978433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311011231) 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, 259890340 + ... + 259890421.

It is an arithmetic number, because the mean of its divisors is an integer number (5457698001).

Almost surely, 2^21311011201 is an apocalyptic number.

It is an amenable number.

21311011201 is a deficient number, since it is larger than the sum of its proper divisors (519780803).

21311011201 is an equidigital number, since it uses as much as digits as its factorization.

21311011201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519780802.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21311011201 its reverse (10211011312), we get a palindrome (31522022513).

The spelling of 21311011201 in words is "twenty-one billion, three hundred eleven million, eleven thousand, two hundred one".