21201126411 has 24 divisors (see below), whose sum is σ = 30230535600. Its totient is φ = 13213307392.

The previous prime is 21201126391. The next prime is 21201126433. The reversal of 21201126411 is 11462110212.

It is not a de Polignac number, because 21201126411 - 2⁵ = 21201126379 is a prime.

It is a super-2 number, since 2×21201126411² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21201126481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47125 + ... + 211241.

It is an arithmetic number, because the mean of its divisors is an integer number (1259605650).

Almost surely, 2^21201126411 is an apocalyptic number.

21201126411 is a deficient number, since it is larger than the sum of its proper divisors (9029409189).

21201126411 is a wasteful number, since it uses less digits than its factorization.

21201126411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164303 (or 164286 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21201126411 its reverse (11462110212), we get a palindrome (32663236623).

The spelling of 21201126411 in words is "twenty-one billion, two hundred one million, one hundred twenty-six thousand, four hundred eleven".