220021500 has 48 divisors (see below), whose sum is σ = 640706976. Its totient is φ = 58672000.

The previous prime is 220021469. The next prime is 220021507. The reversal of 220021500 is 5120022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220021507) 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, 71841 + ... + 74840.

It is an arithmetic number, because the mean of its divisors is an integer number (13348062).

Almost surely, 2^220021500 is an apocalyptic number.

220021500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220021500 is an abundant number, since it is smaller than the sum of its proper divisors (420685476).

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

220021500 is a wasteful number, since it uses less digits than its factorization.

220021500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146703 (or 146691 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 220021500 is about 14833.1217213370. The cubic root of 220021500 is about 603.7007384075.

Adding to 220021500 its reverse (5120022), we get a palindrome (225141522).

The spelling of 220021500 in words is "two hundred twenty million, twenty-one thousand, five hundred".