21778414107 has 8 divisors (see below), whose sum is σ = 29038598976. Its totient is φ = 14518585992.

The previous prime is 21778414067. The next prime is 21778414157. The reversal of 21778414107 is 70141487712.

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

It is not a de Polignac number, because 21778414107 - 2²³ = 21770025499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21778414157) 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, 130708 + ... + 246254.

It is an arithmetic number, because the mean of its divisors is an integer number (3629824872).

Almost surely, 2^21778414107 is an apocalyptic number.

21778414107 is a deficient number, since it is larger than the sum of its proper divisors (7260184869).

21778414107 is a wasteful number, since it uses less digits than its factorization.

21778414107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178377.

The product of its (nonzero) digits is 87808, while the sum is 42.

The spelling of 21778414107 in words is "twenty-one billion, seven hundred seventy-eight million, four hundred fourteen thousand, one hundred seven".