221037390 has 128 divisors (see below), whose sum is σ = 680555520. Its totient is φ = 50004864.

The previous prime is 221037367. The next prime is 221037403. The reversal of 221037390 is 93730122.

221037390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 201684 + ... + 202776.

It is an arithmetic number, because the mean of its divisors is an integer number (5316840).

Almost surely, 2^221037390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221037390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (340277760).

221037390 is an abundant number, since it is smaller than the sum of its proper divisors (459518130).

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

221037390 is a wasteful number, since it uses less digits than its factorization.

221037390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223 (or 1217 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 221037390 is about 14867.3262559211. The cubic root of 221037390 is about 604.6284538823.

The spelling of 221037390 in words is "two hundred twenty-one million, thirty-seven thousand, three hundred ninety".