21403422017 has 8 divisors (see below), whose sum is σ = 21467465472. Its totient is φ = 21339410400.

The previous prime is 21403421993. The next prime is 21403422049. The reversal of 21403422017 is 71022430412.

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 21403422017 - 2⁸ = 21403421761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21403422517) 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, 2311517 + ... + 2320757.

It is an arithmetic number, because the mean of its divisors is an integer number (2683433184).

Almost surely, 2^21403422017 is an apocalyptic number.

It is an amenable number.

21403422017 is a deficient number, since it is larger than the sum of its proper divisors (64043455).

21403422017 is an equidigital number, since it uses as much as digits as its factorization.

21403422017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15919.

The product of its (nonzero) digits is 2688, while the sum is 26.

Adding to 21403422017 its reverse (71022430412), we get a palindrome (92425852429).

The spelling of 21403422017 in words is "twenty-one billion, four hundred three million, four hundred twenty-two thousand, seventeen".