21410262581 has 8 divisors (see below), whose sum is σ = 21633406080. Its totient is φ = 21187413072.

The previous prime is 21410262557. The next prime is 21410262611. The reversal of 21410262581 is 18526201412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21410262581 - 2¹⁰ = 21410261557 is a prime.

It is a super-2 number, since 2×21410262581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410262521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74456 + ... + 219918.

It is an arithmetic number, because the mean of its divisors is an integer number (2704175760).

Almost surely, 2^21410262581 is an apocalyptic number.

It is an amenable number.

21410262581 is a deficient number, since it is larger than the sum of its proper divisors (223143499).

21410262581 is a wasteful number, since it uses less digits than its factorization.

21410262581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146995.

The product of its (nonzero) digits is 7680, while the sum is 32.

Adding to 21410262581 its reverse (18526201412), we get a palindrome (39936463993).

The spelling of 21410262581 in words is "twenty-one billion, four hundred ten million, two hundred sixty-two thousand, five hundred eighty-one".