221023041500 has 24 divisors (see below), whose sum is σ = 482714323728. Its totient is φ = 88409216400.

The previous prime is 221023041479. The next prime is 221023041517. The reversal of 221023041500 is 5140320122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221022542 + ... + 221023541.

It is an arithmetic number, because the mean of its divisors is an integer number (20113096822).

Almost surely, 2^221023041500 is an apocalyptic number.

221023041500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221023041500 is an abundant number, since it is smaller than the sum of its proper divisors (261691282228).

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

221023041500 is a wasteful number, since it uses less digits than its factorization.

221023041500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442046102 (or 442046090 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 221023041500 its reverse (5140320122), we get a palindrome (226163361622).

The spelling of 221023041500 in words is "two hundred twenty-one billion, twenty-three million, forty-one thousand, five hundred".