21214445587 has 2 divisors, whose sum is σ = 21214445588. Its totient is φ = 21214445586.

The previous prime is 21214445579. The next prime is 21214445621. The reversal of 21214445587 is 78554441212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21214445587 - 2³ = 21214445579 is a prime.

It is not a weakly prime, because it can be changed into another prime (21214440587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607222793 + 10607222794.

It is an arithmetic number, because the mean of its divisors is an integer number (10607222794).

Almost surely, 2^21214445587 is an apocalyptic number.

21214445587 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214445587 is an equidigital number, since it uses as much as digits as its factorization.

21214445587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 358400, while the sum is 43.

Adding to 21214445587 its reverse (78554441212), we get a palindrome (99768886799).

The spelling of 21214445587 in words is "twenty-one billion, two hundred fourteen million, four hundred forty-five thousand, five hundred eighty-seven".