21905284032001 has 4 divisors (see below), whose sum is σ = 22131111702532. Its totient is φ = 21679456361472.

The previous prime is 21905284031977. The next prime is 21905284032029. The reversal of 21905284032001 is 10023048250912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14956782760000 + 6948501272001 = 3867400^2 + 2636001^2 .

It is a cyclic number.

It is not a de Polignac number, because 21905284032001 - 2²⁵ = 21905250477569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21905284032031) 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, 112913835120 + ... + 112913835313.

It is an arithmetic number, because the mean of its divisors is an integer number (5532777925633).

Almost surely, 2^{21905284032001} is an apocalyptic number.

It is an amenable number.

21905284032001 is a deficient number, since it is larger than the sum of its proper divisors (225827670531).

21905284032001 is an equidigital number, since it uses as much as digits as its factorization.

21905284032001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225827670530.

The product of its (nonzero) digits is 34560, while the sum is 37.

The spelling of 21905284032001 in words is "twenty-one trillion, nine hundred five billion, two hundred eighty-four million, thirty-two thousand, one".