221000700 has 72 divisors (see below), whose sum is σ = 640927728. Its totient is φ = 58795520.

The previous prime is 221000699. The next prime is 221000719. The reversal of 221000700 is 7000122.

221000700 = T₃₃₆ + T₃₃₇ + ... + T₁₁₀₈.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231424 + ... + 232376.

It is an arithmetic number, because the mean of its divisors is an integer number (8901774).

Almost surely, 2^221000700 is an apocalyptic number.

221000700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221000700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320463864).

221000700 is an abundant number, since it is smaller than the sum of its proper divisors (419927028).

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

221000700 is a wasteful number, since it uses less digits than its factorization.

221000700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743 (or 1736 counting only the distinct ones).

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 221000700 is about 14866.0922908477. The cubic root of 221000700 is about 604.5949979355.

Adding to 221000700 its reverse (7000122), we get a palindrome (228000822).

The spelling of 221000700 in words is "two hundred twenty-one million, seven hundred", and thus it is an aban number.