21256633114071 has 16 divisors (see below), whose sum is σ = 28361639909088. Its totient is φ = 14161360640000.

The previous prime is 21256633114037. The next prime is 21256633114091. The reversal of 21256633114071 is 17041133665212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21256633114071 - 2¹³ = 21256633105879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256633114091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27185401 + ... + 27956381.

It is an arithmetic number, because the mean of its divisors is an integer number (1772602494318).

Almost surely, 2^{21256633114071} is an apocalyptic number.

21256633114071 is a deficient number, since it is larger than the sum of its proper divisors (7105006795017).

21256633114071 is a wasteful number, since it uses less digits than its factorization.

21256633114071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777282.

The product of its (nonzero) digits is 181440, while the sum is 42.

Adding to 21256633114071 its reverse (17041133665212), we get a palindrome (38297766779283).

The spelling of 21256633114071 in words is "twenty-one trillion, two hundred fifty-six billion, six hundred thirty-three million, one hundred fourteen thousand, seventy-one".