21616220331203 has 4 divisors (see below), whose sum is σ = 21616913434320. Its totient is φ = 21615527228088.

The previous prime is 21616220331163. The next prime is 21616220331247. The reversal of 21616220331203 is 30213302261612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21616220331203 is a prime.

It is a super-2 number, since 2×21616220331203² (a number of 27 digits) contains 22 as substring.

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 21616220331203.

It is not an unprimeable number, because it can be changed into a prime (21616220331263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346504775 + ... + 346567152.

It is an arithmetic number, because the mean of its divisors is an integer number (5404228358580).

Almost surely, 2^{21616220331203} is an apocalyptic number.

21616220331203 is a deficient number, since it is larger than the sum of its proper divisors (693103117).

21616220331203 is an equidigital number, since it uses as much as digits as its factorization.

21616220331203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693103116.

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 21616220331203 its reverse (30213302261612), we get a palindrome (51829522592815).

The spelling of 21616220331203 in words is "twenty-one trillion, six hundred sixteen billion, two hundred twenty million, three hundred thirty-one thousand, two hundred three".