21503023201545 has 16 divisors (see below), whose sum is σ = 34876136262912. Its totient is φ = 11311179327360.

The previous prime is 21503023201531. The next prime is 21503023201567. The reversal of 21503023201545 is 54510232030512.

It is not a de Polignac number, because 21503023201545 - 2¹⁰ = 21503023200521 is a prime.

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, 9818730961 + ... + 9818733150.

It is an arithmetic number, because the mean of its divisors is an integer number (2179758516432).

Almost surely, 2^{21503023201545} is an apocalyptic number.

It is an amenable number.

21503023201545 is a deficient number, since it is larger than the sum of its proper divisors (13373113061367).

21503023201545 is a wasteful number, since it uses less digits than its factorization.

21503023201545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19637464192.

The product of its (nonzero) digits is 36000, while the sum is 33.

The spelling of 21503023201545 in words is "twenty-one trillion, five hundred three billion, twenty-three million, two hundred one thousand, five hundred forty-five".