21577770606 has 32 divisors (see below), whose sum is σ = 49365439488. Its totient is φ = 6159474720.

The previous prime is 21577770563. The next prime is 21577770647. The reversal of 21577770606 is 60607777512.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent 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, 186565 + ... + 279216.

It is an arithmetic number, because the mean of its divisors is an integer number (1542669984).

Almost surely, 2^21577770606 is an apocalyptic number.

21577770606 is an abundant number, since it is smaller than the sum of its proper divisors (27787668882).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21577770606 is a wasteful number, since it uses less digits than its factorization.

21577770606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466896.

The product of its (nonzero) digits is 864360, while the sum is 48.

The spelling of 21577770606 in words is "twenty-one billion, five hundred seventy-seven million, seven hundred seventy thousand, six hundred six".