21221365043005 has 64 divisors (see below), whose sum is σ = 27302220288000. Its totient is φ = 15779234304000.

The previous prime is 21221365043003. The next prime is 21221365043009. The reversal of 21221365043005 is 50034056312212.

It is not a de Polignac number, because 21221365043005 - 2¹ = 21221365043003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221365043003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2178109164 + ... + 2178118906.

It is an arithmetic number, because the mean of its divisors is an integer number (426597192000).

Almost surely, 2^{21221365043005} is an apocalyptic number.

It is an amenable number.

21221365043005 is a deficient number, since it is larger than the sum of its proper divisors (6080855244995).

21221365043005 is a wasteful number, since it uses less digits than its factorization.

21221365043005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10894.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21221365043005 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-five million, forty-three thousand, five".