21320453145 has 32 divisors (see below), whose sum is σ = 34389129600. Its totient is φ = 11278923264.

The previous prime is 21320453137. The next prime is 21320453159. The reversal of 21320453145 is 54135402312.

It is not a de Polignac number, because 21320453145 - 2³ = 21320453137 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2683599 + ... + 2691531.

It is an arithmetic number, because the mean of its divisors is an integer number (1074660300).

Almost surely, 2^21320453145 is an apocalyptic number.

It is an amenable number.

21320453145 is a deficient number, since it is larger than the sum of its proper divisors (13068676455).

21320453145 is a wasteful number, since it uses less digits than its factorization.

21320453145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9369.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 21320453145 its reverse (54135402312), we get a palindrome (75455855457).

The spelling of 21320453145 in words is "twenty-one billion, three hundred twenty million, four hundred fifty-three thousand, one hundred forty-five".