21256044446135 has 32 divisors (see below), whose sum is σ = 27533932257600. Its totient is φ = 15694050918400.

The previous prime is 21256044446129. The next prime is 21256044446149. The reversal of 21256044446135 is 53164444065212.

It is not a de Polignac number, because 21256044446135 - 2¹⁴ = 21256044429751 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21256044446135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3273890 + ... + 7295919.

It is an arithmetic number, because the mean of its divisors is an integer number (860435383050).

Almost surely, 2^{21256044446135} is an apocalyptic number.

21256044446135 is a deficient number, since it is larger than the sum of its proper divisors (6277887811465).

21256044446135 is a wasteful number, since it uses less digits than its factorization.

21256044446135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10570291.

The product of its (nonzero) digits is 2764800, while the sum is 47.

The spelling of 21256044446135 in words is "twenty-one trillion, two hundred fifty-six billion, forty-four million, four hundred forty-six thousand, one hundred thirty-five".