21671002573741 has 4 divisors (see below), whose sum is σ = 21755325541212. Its totient is φ = 21586679606272.

The previous prime is 21671002573729. The next prime is 21671002573769. The reversal of 21671002573741 is 14737520017612.

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 11366196361641 + 10304806212100 = 3371379^2 + 3210110^2 .

It is a cyclic number.

It is not a de Polignac number, because 21671002573741 - 2³¹ = 21668855090093 is a prime.

It is a super-2 number, since 2×21671002573741² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21671002573691 and 21671002573700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21671002573841) 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, 42161483350 + ... + 42161483863.

It is an arithmetic number, because the mean of its divisors is an integer number (5438831385303).

Almost surely, 2^{21671002573741} is an apocalyptic number.

It is an amenable number.

21671002573741 is a deficient number, since it is larger than the sum of its proper divisors (84322967471).

21671002573741 is an equidigital number, since it uses as much as digits as its factorization.

21671002573741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84322967470.

The product of its (nonzero) digits is 493920, while the sum is 46.

The spelling of 21671002573741 in words is "twenty-one trillion, six hundred seventy-one billion, two million, five hundred seventy-three thousand, seven hundred forty-one".