15500211220 has 48 divisors (see below), whose sum is σ = 35277692688. Its totient is φ = 5686686720.

The previous prime is 15500211197. The next prime is 15500211289. The reversal of 15500211220 is 2211200551.

15500211220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 188128656 + 15312082564 = 13716^2 + 123742^2 .

It is a super-2 number, since 2×15500211220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149041 + ... + 230680.

It is an arithmetic number, because the mean of its divisors is an integer number (734951931).

Almost surely, 2^15500211220 is an apocalyptic number.

15500211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15500211220 is an abundant number, since it is smaller than the sum of its proper divisors (19777481468).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15500211220 is a wasteful number, since it uses less digits than its factorization.

15500211220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379900 (or 379898 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

Adding to 15500211220 its reverse (2211200551), we get a palindrome (17711411771).

The spelling of 15500211220 in words is "fifteen billion, five hundred million, two hundred eleven thousand, two hundred twenty".