21170050427 has 8 divisors (see below), whose sum is σ = 21707524320. Its totient is φ = 20638719360.

The previous prime is 21170050417. The next prime is 21170050441. The reversal of 21170050427 is 72405007112.

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 21170050427 - 2¹⁴ = 21170034043 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21170050427.

It is not an unprimeable number, because it can be changed into a prime (21170050417) 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, 1528727 + ... + 1542512.

It is an arithmetic number, because the mean of its divisors is an integer number (2713440540).

Almost surely, 2^21170050427 is an apocalyptic number.

21170050427 is a deficient number, since it is larger than the sum of its proper divisors (537473893).

21170050427 is a wasteful number, since it uses less digits than its factorization.

21170050427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3071413.

The product of its (nonzero) digits is 3920, while the sum is 29.

Adding to 21170050427 its reverse (72405007112), we get a palindrome (93575057539).

The spelling of 21170050427 in words is "twenty-one billion, one hundred seventy million, fifty thousand, four hundred twenty-seven".