10021561221766 has 8 divisors (see below), whose sum is σ = 15075414446400. Its totient is φ = 4996423072968.

The previous prime is 10021561221713. The next prime is 10021561221827. The reversal of 10021561221766 is 66712216512001.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7178768086 + ... + 7178769481.

It is an arithmetic number, because the mean of its divisors is an integer number (1884426805800).

Almost surely, 2^{10021561221766} is an apocalyptic number.

10021561221766 is a deficient number, since it is larger than the sum of its proper divisors (5053853224634).

10021561221766 is a wasteful number, since it uses less digits than its factorization.

10021561221766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14357537918.

The product of its (nonzero) digits is 60480, while the sum is 40.

Adding to 10021561221766 its reverse (66712216512001), we get a palindrome (76733777733767).

The spelling of 10021561221766 in words is "ten trillion, twenty-one billion, five hundred sixty-one million, two hundred twenty-one thousand, seven hundred sixty-six".