21545366485 has 8 divisors (see below), whose sum is σ = 26058018816. Its totient is φ = 17100573840.

The previous prime is 21545366467. The next prime is 21545366509. The reversal of 21545366485 is 58466354512.

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

It is not a de Polignac number, because 21545366485 - 2²¹ = 21543269333 is a prime.

It is a super-2 number, since 2×21545366485² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16964221 + ... + 16965490.

It is an arithmetic number, because the mean of its divisors is an integer number (3257252352).

Almost surely, 2^21545366485 is an apocalyptic number.

It is an amenable number.

21545366485 is a deficient number, since it is larger than the sum of its proper divisors (4512652331).

21545366485 is a wasteful number, since it uses less digits than its factorization.

21545366485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33929843.

The product of its digits is 3456000, while the sum is 49.

The spelling of 21545366485 in words is "twenty-one billion, five hundred forty-five million, three hundred sixty-six thousand, four hundred eighty-five".