21403103213217 has 32 divisors (see below), whose sum is σ = 31184094485376. Its totient is φ = 12949800537600.

The previous prime is 21403103213213. The next prime is 21403103213227. The reversal of 21403103213217 is 71231230130412.

It is not a de Polignac number, because 21403103213217 - 2² = 21403103213213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403103213213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48060423 + ... + 48503715.

It is an arithmetic number, because the mean of its divisors is an integer number (974502952668).

Almost surely, 2^{21403103213217} is an apocalyptic number.

It is an amenable number.

21403103213217 is a deficient number, since it is larger than the sum of its proper divisors (9780991272159).

21403103213217 is a wasteful number, since it uses less digits than its factorization.

21403103213217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445761.

The product of its (nonzero) digits is 6048, while the sum is 30.

Adding to 21403103213217 its reverse (71231230130412), we get a palindrome (92634333343629).

The spelling of 21403103213217 in words is "twenty-one trillion, four hundred three billion, one hundred three million, two hundred thirteen thousand, two hundred seventeen".