15211440205 has 16 divisors (see below), whose sum is σ = 19661886720. Its totient is φ = 11230763328.

The previous prime is 15211440203. The next prime is 15211440221. The reversal of 15211440205 is 50204411251.

It is a cyclic number.

It is not a de Polignac number, because 15211440205 - 2¹ = 15211440203 is a prime.

It is a super-2 number, since 2×15211440205² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15211440205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15211440203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337534 + ... + 379936.

It is an arithmetic number, because the mean of its divisors is an integer number (1228867920).

Almost surely, 2^15211440205 is an apocalyptic number.

It is an amenable number.

15211440205 is a deficient number, since it is larger than the sum of its proper divisors (4450446515).

15211440205 is a wasteful number, since it uses less digits than its factorization.

15211440205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47940.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 15211440205 its reverse (50204411251), we get a palindrome (65415851456).

The spelling of 15211440205 in words is "fifteen billion, two hundred eleven million, four hundred forty thousand, two hundred five".