21777820220578 has 8 divisors (see below), whose sum is σ = 32666796730368. Its totient is φ = 10888887977124.

The previous prime is 21777820220501. The next prime is 21777820220587. The reversal of 21777820220578 is 87502202877712.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9808026 + ... + 11821717.

It is an arithmetic number, because the mean of its divisors is an integer number (4083349591296).

Almost surely, 2^{21777820220578} is an apocalyptic number.

21777820220578 is a deficient number, since it is larger than the sum of its proper divisors (10888976509790).

21777820220578 is a wasteful number, since it uses less digits than its factorization.

21777820220578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22133168.

The product of its (nonzero) digits is 12293120, while the sum is 58.

The spelling of 21777820220578 in words is "twenty-one trillion, seven hundred seventy-seven billion, eight hundred twenty million, two hundred twenty thousand, five hundred seventy-eight".