21545000039987 has 8 divisors (see below), whose sum is σ = 21931325693712. Its totient is φ = 21159743061600.

The previous prime is 21545000039939. The next prime is 21545000039989. The reversal of 21545000039987 is 78993000054512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21545000039987 - 2¹⁰ = 21545000038963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21545000039989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 267128153 + ... + 267208794.

It is an arithmetic number, because the mean of its divisors is an integer number (2741415711714).

Almost surely, 2^{21545000039987} is an apocalyptic number.

21545000039987 is a deficient number, since it is larger than the sum of its proper divisors (386325653725).

21545000039987 is an equidigital number, since it uses as much as digits as its factorization.

21545000039987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534337669.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The spelling of 21545000039987 in words is "twenty-one trillion, five hundred forty-five billion, thirty-nine thousand, nine hundred eighty-seven".