15211052105 has 4 divisors (see below), whose sum is σ = 18253262532. Its totient is φ = 12168841680.

The previous prime is 15211052089. The next prime is 15211052117. The reversal of 15211052105 is 50125011251.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8528153104 + 6682899001 = 92348^2 + 81749^2 .

It is not a de Polignac number, because 15211052105 - 2⁴ = 15211052089 is a prime.

It is a super-2 number, since 2×15211052105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521105206 + ... + 1521105215.

It is an arithmetic number, because the mean of its divisors is an integer number (4563315633).

Almost surely, 2^15211052105 is an apocalyptic number.

It is an amenable number.

15211052105 is a deficient number, since it is larger than the sum of its proper divisors (3042210427).

15211052105 is an equidigital number, since it uses as much as digits as its factorization.

15211052105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3042210426.

The product of its (nonzero) digits is 500, while the sum is 23.

Adding to 15211052105 its reverse (50125011251), we get a palindrome (65336063356).

The spelling of 15211052105 in words is "fifteen billion, two hundred eleven million, fifty-two thousand, one hundred five".