21225105311 has 4 divisors (see below), whose sum is σ = 21234742152. Its totient is φ = 21215468472.

The previous prime is 21225105299. The next prime is 21225105323. The reversal of 21225105311 is 11350152212.

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

It is an interprime number because it is at equal distance from previous prime (21225105299) and next prime (21225105323).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21225105311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225105911) 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, 4815116 + ... + 4819521.

It is an arithmetic number, because the mean of its divisors is an integer number (5308685538).

Almost surely, 2^21225105311 is an apocalyptic number.

21225105311 is a deficient number, since it is larger than the sum of its proper divisors (9636841).

21225105311 is an equidigital number, since it uses as much as digits as its factorization.

21225105311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9636840.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 21225105311 its reverse (11350152212), we get a palindrome (32575257523).

The spelling of 21225105311 in words is "twenty-one billion, two hundred twenty-five million, one hundred five thousand, three hundred eleven".