21770603206 has 16 divisors (see below), whose sum is σ = 37720190160. Its totient is φ = 9313626880.

The previous prime is 21770603093. The next prime is 21770603233. The reversal of 21770603206 is 60230607712.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29104711 + ... + 29105458.

It is an arithmetic number, because the mean of its divisors is an integer number (2357511885).

Almost surely, 2^21770603206 is an apocalyptic number.

21770603206 is a deficient number, since it is larger than the sum of its proper divisors (15949586954).

21770603206 is a wasteful number, since it uses less digits than its factorization.

21770603206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58210199.

The product of its (nonzero) digits is 21168, while the sum is 34.

The spelling of 21770603206 in words is "twenty-one billion, seven hundred seventy million, six hundred three thousand, two hundred six".