21435565027 has 4 divisors (see below), whose sum is σ = 22563752680. Its totient is φ = 20307377376.

The previous prime is 21435565003. The next prime is 21435565031. The reversal of 21435565027 is 72056553412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21435565027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21435565087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564093798 + ... + 564093835.

It is an arithmetic number, because the mean of its divisors is an integer number (5640938170).

Almost surely, 2^21435565027 is an apocalyptic number.

21435565027 is a deficient number, since it is larger than the sum of its proper divisors (1128187653).

21435565027 is a wasteful number, since it uses less digits than its factorization.

21435565027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128187652.

The product of its (nonzero) digits is 252000, while the sum is 40.

The spelling of 21435565027 in words is "twenty-one billion, four hundred thirty-five million, five hundred sixty-five thousand, twenty-seven".