21204033211 has 16 divisors (see below), whose sum is σ = 22137906240. Its totient is φ = 20284387200.

The previous prime is 21204033199. The next prime is 21204033251. The reversal of 21204033211 is 11233040212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21204033211 - 2¹⁹ = 21203508923 is a prime.

It is a super-2 number, since 2×21204033211² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21204033251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1732365 + ... + 1744561.

It is an arithmetic number, because the mean of its divisors is an integer number (1383619140).

Almost surely, 2^21204033211 is an apocalyptic number.

21204033211 is a deficient number, since it is larger than the sum of its proper divisors (933873029).

21204033211 is a wasteful number, since it uses less digits than its factorization.

21204033211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12774.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21204033211 its reverse (11233040212), we get a palindrome (32437073423).

The spelling of 21204033211 in words is "twenty-one billion, two hundred four million, thirty-three thousand, two hundred eleven".