21545001319 has 2 divisors, whose sum is σ = 21545001320. Its totient is φ = 21545001318.

The previous prime is 21545001293. The next prime is 21545001419. The reversal of 21545001319 is 91310054512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21545001319 - 2⁵ = 21545001287 is a prime.

It is a super-2 number, since 2×21545001319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21545001419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772500659 + 10772500660.

It is an arithmetic number, because the mean of its divisors is an integer number (10772500660).

Almost surely, 2^21545001319 is an apocalyptic number.

21545001319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21545001319 is an equidigital number, since it uses as much as digits as its factorization.

21545001319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 21545001319 in words is "twenty-one billion, five hundred forty-five million, one thousand, three hundred nineteen".