21760212056 has 32 divisors (see below), whose sum is σ = 44589534480. Its totient is φ = 9873225600.

The previous prime is 21760212011. The next prime is 21760212073. The reversal of 21760212056 is 65021206712.

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, 172955 + ... + 270986.

Almost surely, 2^21760212056 is an apocalyptic number.

It is an amenable number.

21760212056 is an abundant number, since it is smaller than the sum of its proper divisors (22829322424).

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

21760212056 is a wasteful number, since it uses less digits than its factorization.

21760212056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444515 (or 444511 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 21760212056 its reverse (65021206712), we get a palindrome (86781418768).

The spelling of 21760212056 in words is "twenty-one billion, seven hundred sixty million, two hundred twelve thousand, fifty-six".