21323033561545 has 16 divisors (see below), whose sum is σ = 25690360963968. Its totient is φ = 16989962711040.

The previous prime is 21323033561521. The next prime is 21323033561573. The reversal of 21323033561545 is 54516533032312.

It is not a de Polignac number, because 21323033561545 - 2⁵ = 21323033561513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9478690 + ... + 11510500.

It is an arithmetic number, because the mean of its divisors is an integer number (1605647560248).

Almost surely, 2^{21323033561545} is an apocalyptic number.

It is an amenable number.

21323033561545 is a deficient number, since it is larger than the sum of its proper divisors (4367327402423).

21323033561545 is a wasteful number, since it uses less digits than its factorization.

21323033561545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040240.

The product of its (nonzero) digits is 972000, while the sum is 43.

Adding to 21323033561545 its reverse (54516533032312), we get a palindrome (75839566593857).

The spelling of 21323033561545 in words is "twenty-one trillion, three hundred twenty-three billion, thirty-three million, five hundred sixty-one thousand, five hundred forty-five".