221781030 has 16 divisors (see below), whose sum is σ = 532274544. Its totient is φ = 59141600.

The previous prime is 221781029. The next prime is 221781041. The reversal of 221781030 is 30187122.

221781030 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3696321 + ... + 3696380.

It is an arithmetic number, because the mean of its divisors is an integer number (33267159).

Almost surely, 2^221781030 is an apocalyptic number.

221781030 is an abundant number, since it is smaller than the sum of its proper divisors (310493514).

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

221781030 is a wasteful number, since it uses less digits than its factorization.

221781030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7392711.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 221781030 is about 14892.3144608217. The cubic root of 221781030 is about 605.3057489705.

The spelling of 221781030 in words is "two hundred twenty-one million, seven hundred eighty-one thousand, thirty".