21216763617627 has 8 divisors (see below), whose sum is σ = 28299827880016. Its totient is φ = 14139104216832.

The previous prime is 21216763617613. The next prime is 21216763617661. The reversal of 21216763617627 is 72671636761212.

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

It is not a de Polignac number, because 21216763617627 - 2¹⁰ = 21216763616603 is a prime.

It is a super-2 number, since 2×21216763617627² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21216763617227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351206238 + ... + 1351221939.

It is an arithmetic number, because the mean of its divisors is an integer number (3537478485002).

Almost surely, 2^{21216763617627} is an apocalyptic number.

21216763617627 is a deficient number, since it is larger than the sum of its proper divisors (7083064262389).

21216763617627 is a wasteful number, since it uses less digits than its factorization.

21216763617627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2702430797.

The product of its digits is 10668672, while the sum is 57.

The spelling of 21216763617627 in words is "twenty-one trillion, two hundred sixteen billion, seven hundred sixty-three million, six hundred seventeen thousand, six hundred twenty-seven".