221215001500 has 48 divisors (see below), whose sum is σ = 499793374080. Its totient is φ = 85434753600.

The previous prime is 221215001401. The next prime is 221215001573. The reversal of 221215001500 is 5100512122.

221215001500 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 7613604 + ... + 7642603.

It is an arithmetic number, because the mean of its divisors is an integer number (10412361960).

Almost surely, 2^221215001500 is an apocalyptic number.

221215001500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221215001500 is an abundant number, since it is smaller than the sum of its proper divisors (278578372580).

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

221215001500 is a wasteful number, since it uses less digits than its factorization.

221215001500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15256255 (or 15256243 counting only the distinct ones).

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

Adding to 221215001500 its reverse (5100512122), we get a palindrome (226315513622).

The spelling of 221215001500 in words is "two hundred twenty-one billion, two hundred fifteen million, one thousand, five hundred".