21261011050411 has 4 divisors (see below), whose sum is σ = 23193830236824. Its totient is φ = 19328191864000.

The previous prime is 21261011050351. The next prime is 21261011050459. The reversal of 21261011050411 is 11405011016212.

It is a happy number.

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 21261011050411 - 2¹⁵ = 21261011017643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21261011080411) 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, 966409593190 + ... + 966409593211.

It is an arithmetic number, because the mean of its divisors is an integer number (5798457559206).

Almost surely, 2^{21261011050411} is an apocalyptic number.

21261011050411 is a deficient number, since it is larger than the sum of its proper divisors (1932819186413).

21261011050411 is a wasteful number, since it uses less digits than its factorization.

21261011050411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932819186412.

The product of its (nonzero) digits is 480, while the sum is 25.

Adding to 21261011050411 its reverse (11405011016212), we get a palindrome (32666022066623).

The spelling of 21261011050411 in words is "twenty-one trillion, two hundred sixty-one billion, eleven million, fifty thousand, four hundred eleven".