21630771260211 has 16 divisors (see below), whose sum is σ = 28993851981216. Its totient is φ = 14344119822336.

The previous prime is 21630771260207. The next prime is 21630771260299. The reversal of 21630771260211 is 11206217703612.

It is not a de Polignac number, because 21630771260211 - 2² = 21630771260207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21630771260211.

It is not an unprimeable number, because it can be changed into a prime (21630771260411) 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, 2784901 + ... + 7142633.

It is an arithmetic number, because the mean of its divisors is an integer number (1812115748826).

Almost surely, 2^{21630771260211} is an apocalyptic number.

21630771260211 is a deficient number, since it is larger than the sum of its proper divisors (7363080721005).

21630771260211 is a wasteful number, since it uses less digits than its factorization.

21630771260211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366502.

The product of its (nonzero) digits is 42336, while the sum is 39.

Adding to 21630771260211 its reverse (11206217703612), we get a palindrome (32836988963823).

The spelling of 21630771260211 in words is "twenty-one trillion, six hundred thirty billion, seven hundred seventy-one million, two hundred sixty thousand, two hundred eleven".