21581082023 has 8 divisors (see below), whose sum is σ = 21753751776. Its totient is φ = 21408804000.

The previous prime is 21581082011. The next prime is 21581082041. The reversal of 21581082023 is 32028018512.

It is a happy number.

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 21581082023 - 2⁶ = 21581081959 is a prime.

It is a super-3 number, since 3×21581082023³ (a number of 32 digits) contains 333 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 (21581082043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13193 + ... + 208173.

It is an arithmetic number, because the mean of its divisors is an integer number (2719218972).

Almost surely, 2^21581082023 is an apocalyptic number.

21581082023 is a deficient number, since it is larger than the sum of its proper divisors (172669753).

21581082023 is a wasteful number, since it uses less digits than its factorization.

21581082023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195865.

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

The spelling of 21581082023 in words is "twenty-one billion, five hundred eighty-one million, eighty-two thousand, twenty-three".