221709030 has 64 divisors (see below), whose sum is σ = 547803648. Its totient is φ = 57404160.

The previous prime is 221709023. The next prime is 221709049. The reversal of 221709030 is 30907122.

221709030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 145975 + ... + 147485.

It is an arithmetic number, because the mean of its divisors is an integer number (8559432).

Almost surely, 2^221709030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221709030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273901824).

221709030 is an abundant number, since it is smaller than the sum of its proper divisors (326094618).

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

221709030 is a wasteful number, since it uses less digits than its factorization.

221709030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 221709030 is about 14889.8969103214. The cubic root of 221709030 is about 605.2402388124.

The spelling of 221709030 in words is "two hundred twenty-one million, seven hundred nine thousand, thirty".