21677216747 has 8 divisors (see below), whose sum is σ = 21859965072. Its totient is φ = 21494730400.

The previous prime is 21677216713. The next prime is 21677216761. The reversal of 21677216747 is 74761277612.

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

It is a cyclic number.

It is not a de Polignac number, because 21677216747 - 2¹⁰ = 21677215723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21677216695 and 21677216704.

It is not an unprimeable number, because it can be changed into a prime (21677210747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102497 + ... + 232077.

It is an arithmetic number, because the mean of its divisors is an integer number (2732495634).

Almost surely, 2^21677216747 is an apocalyptic number.

21677216747 is a deficient number, since it is larger than the sum of its proper divisors (182748325).

21677216747 is a wasteful number, since it uses less digits than its factorization.

21677216747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130989.

The product of its digits is 1382976, while the sum is 50.

The spelling of 21677216747 in words is "twenty-one billion, six hundred seventy-seven million, two hundred sixteen thousand, seven hundred forty-seven".