21217276210677 has 4 divisors (see below), whose sum is σ = 28289701614240. Its totient is φ = 14144850807116.

The previous prime is 21217276210573. The next prime is 21217276210699. The reversal of 21217276210677 is 77601267271212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21217276210677 - 2¹¹ = 21217276208629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21217276200677) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536212701777 + ... + 3536212701782.

It is an arithmetic number, because the mean of its divisors is an integer number (7072425403560).

Almost surely, 2^{21217276210677} is an apocalyptic number.

It is an amenable number.

21217276210677 is a deficient number, since it is larger than the sum of its proper divisors (7072425403563).

21217276210677 is an equidigital number, since it uses as much as digits as its factorization.

21217276210677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7072425403562.

The product of its (nonzero) digits is 1382976, while the sum is 51.

The spelling of 21217276210677 in words is "twenty-one trillion, two hundred seventeen billion, two hundred seventy-six million, two hundred ten thousand, six hundred seventy-seven".