21011031222205 has 8 divisors (see below), whose sum is σ = 25215578375904. Its totient is φ = 16807264371600.

The previous prime is 21011031222193. The next prime is 21011031222217. The reversal of 21011031222205 is 50222213011012.

It is an interprime number because it is at equal distance from previous prime (21011031222193) and next prime (21011031222217).

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

It is not a de Polignac number, because 21011031222205 - 2¹⁷ = 21011031091133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195016531 + ... + 195124240.

It is an arithmetic number, because the mean of its divisors is an integer number (3151947296988).

Almost surely, 2^{21011031222205} is an apocalyptic number.

It is an amenable number.

21011031222205 is a deficient number, since it is larger than the sum of its proper divisors (4204547153699).

21011031222205 is a wasteful number, since it uses less digits than its factorization.

21011031222205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390151547.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21011031222205 its reverse (50222213011012), we get a palindrome (71233244233217).

The spelling of 21011031222205 in words is "twenty-one trillion, eleven billion, thirty-one million, two hundred twenty-two thousand, two hundred five".