21514951589 has 2 divisors, whose sum is σ = 21514951590. Its totient is φ = 21514951588.

The previous prime is 21514951567. The next prime is 21514951603. The reversal of 21514951589 is 98515941512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18012324100 + 3502627489 = 134210^2 + 59183^2 .

It is a cyclic number.

It is not a de Polignac number, because 21514951589 - 2⁸ = 21514951333 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21514951519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10757475794 + 10757475795.

It is an arithmetic number, because the mean of its divisors is an integer number (10757475795).

Almost surely, 2^21514951589 is an apocalyptic number.

It is an amenable number.

21514951589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21514951589 is an equidigital number, since it uses as much as digits as its factorization.

21514951589 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 50.

The spelling of 21514951589 in words is "twenty-one billion, five hundred fourteen million, nine hundred fifty-one thousand, five hundred eighty-nine".