21439164440441 has 32 divisors (see below), whose sum is σ = 25783772774400. Its totient is φ = 17616921340480.

The previous prime is 21439164440417. The next prime is 21439164440471. The reversal of 21439164440441 is 14404446193412.

It is not a de Polignac number, because 21439164440441 - 2¹⁴ = 21439164424057 is a prime.

It is a super-4 number, since 4×21439164440441⁴ (a number of 54 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21439164440471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30740921 + ... + 31430598.

It is an arithmetic number, because the mean of its divisors is an integer number (805742899200).

Almost surely, 2^{21439164440441} is an apocalyptic number.

It is an amenable number.

21439164440441 is a deficient number, since it is larger than the sum of its proper divisors (4344608333959).

21439164440441 is a wasteful number, since it uses less digits than its factorization.

21439164440441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62171629.

The product of its (nonzero) digits is 1327104, while the sum is 47.

The spelling of 21439164440441 in words is "twenty-one trillion, four hundred thirty-nine billion, one hundred sixty-four million, four hundred forty thousand, four hundred forty-one".