21483123587 has 4 divisors (see below), whose sum is σ = 21485788176. Its totient is φ = 21480459000.

The previous prime is 21483123569. The next prime is 21483123589. The reversal of 21483123587 is 78532138412.

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

It is a cyclic number.

It is not a de Polignac number, because 21483123587 - 2⁸ = 21483123331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21483123589) 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, 1320164 + ... + 1336337.

It is an arithmetic number, because the mean of its divisors is an integer number (5371447044).

Almost surely, 2^21483123587 is an apocalyptic number.

21483123587 is a deficient number, since it is larger than the sum of its proper divisors (2664589).

21483123587 is an equidigital number, since it uses as much as digits as its factorization.

21483123587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664588.

The product of its digits is 322560, while the sum is 44.

The spelling of 21483123587 in words is "twenty-one billion, four hundred eighty-three million, one hundred twenty-three thousand, five hundred eighty-seven".