21570785545 has 8 divisors (see below), whose sum is σ = 25919974080. Its totient is φ = 17233274160.

The previous prime is 21570785507. The next prime is 21570785581. The reversal of 21570785545 is 54558707512.

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

It is not a de Polignac number, because 21570785545 - 2¹¹ = 21570783497 is a prime.

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, 2915221 + ... + 2922610.

It is an arithmetic number, because the mean of its divisors is an integer number (3239996760).

Almost surely, 2^21570785545 is an apocalyptic number.

It is an amenable number.

21570785545 is a deficient number, since it is larger than the sum of its proper divisors (4349188535).

21570785545 is an equidigital number, since it uses as much as digits as its factorization.

21570785545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5838575.

The product of its (nonzero) digits is 1960000, while the sum is 49.

The spelling of 21570785545 in words is "twenty-one billion, five hundred seventy million, seven hundred eighty-five thousand, five hundred forty-five".