21320001211 has 4 divisors (see below), whose sum is σ = 21461193424. Its totient is φ = 21178809000.

The previous prime is 21320001167. The next prime is 21320001229. The reversal of 21320001211 is 11210002312.

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

It is a cyclic number.

It is not a de Polignac number, because 21320001211 - 2⁷ = 21320001083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21320001191 and 21320001200.

It is not an unprimeable number, because it can be changed into a prime (21320001281) 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, 70595880 + ... + 70596181.

It is an arithmetic number, because the mean of its divisors is an integer number (5365298356).

Almost surely, 2^21320001211 is an apocalyptic number.

21320001211 is a deficient number, since it is larger than the sum of its proper divisors (141192213).

21320001211 is a wasteful number, since it uses less digits than its factorization.

21320001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141192212.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21320001211 its reverse (11210002312), we get a palindrome (32530003523).

The spelling of 21320001211 in words is "twenty-one billion, three hundred twenty million, one thousand, two hundred eleven".