21041121454555 has 16 divisors (see below), whose sum is σ = 25533284974560. Its totient is φ = 16643607881472.

The previous prime is 21041121454499. The next prime is 21041121454627. The reversal of 21041121454555 is 55545412114012.

It is a cyclic number.

It is not a de Polignac number, because 21041121454555 - 2⁹ = 21041121454043 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80586877 + ... + 80847553.

It is an arithmetic number, because the mean of its divisors is an integer number (1595830310910).

Almost surely, 2^{21041121454555} is an apocalyptic number.

21041121454555 is a deficient number, since it is larger than the sum of its proper divisors (4492163520005).

21041121454555 is a wasteful number, since it uses less digits than its factorization.

21041121454555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442158.

The product of its (nonzero) digits is 160000, while the sum is 40.

Adding to 21041121454555 its reverse (55545412114012), we get a palindrome (76586533568567).

The spelling of 21041121454555 in words is "twenty-one trillion, forty-one billion, one hundred twenty-one million, four hundred fifty-four thousand, five hundred fifty-five".