21244004211 has 16 divisors (see below), whose sum is σ = 29560559616. Its totient is φ = 13545212736.

The previous prime is 21244004203. The next prime is 21244004213. The reversal of 21244004211 is 11240044212.

It is not a de Polignac number, because 21244004211 - 2³ = 21244004203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244004213) 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, 774711 + ... + 801663.

It is an arithmetic number, because the mean of its divisors is an integer number (1847534976).

Almost surely, 2^21244004211 is an apocalyptic number.

21244004211 is a deficient number, since it is larger than the sum of its proper divisors (8316555405).

21244004211 is a wasteful number, since it uses less digits than its factorization.

21244004211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38402.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21244004211 its reverse (11240044212), we get a palindrome (32484048423).

The spelling of 21244004211 in words is "twenty-one billion, two hundred forty-four million, four thousand, two hundred eleven".