221053500 has 72 divisors (see below), whose sum is σ = 697364304. Its totient is φ = 58946400.

The previous prime is 221053493. The next prime is 221053501. The reversal of 221053500 is 5350122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221053501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20062 + ... + 29061.

Almost surely, 2^221053500 is an apocalyptic number.

221053500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221053500 is an abundant number, since it is smaller than the sum of its proper divisors (476310804).

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

221053500 is a wasteful number, since it uses less digits than its factorization.

221053500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49148 (or 49133 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 221053500 is about 14867.8680381553. The cubic root of 221053500 is about 604.6431426910.

The spelling of 221053500 in words is "two hundred twenty-one million, fifty-three thousand, five hundred".