21355345585 has 16 divisors (see below), whose sum is σ = 29910468096. Its totient is φ = 14332097088.

The previous prime is 21355345579. The next prime is 21355345603. The reversal of 21355345585 is 58554355312.

It is a cyclic number.

It is not a de Polignac number, because 21355345585 - 2³ = 21355345577 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, 6489342 + ... + 6492631.

It is an arithmetic number, because the mean of its divisors is an integer number (1869404256).

Almost surely, 2^21355345585 is an apocalyptic number.

It is an amenable number.

21355345585 is a deficient number, since it is larger than the sum of its proper divisors (8555122511).

21355345585 is a wasteful number, since it uses less digits than its factorization.

21355345585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12982032.

The product of its digits is 1800000, while the sum is 46.

The spelling of 21355345585 in words is "twenty-one billion, three hundred fifty-five million, three hundred forty-five thousand, five hundred eighty-five".