247221366 has 60 divisors (see below), whose sum is σ = 581252316. Its totient is φ = 70095480.

The previous prime is 247221353. The next prime is 247221367. The reversal of 247221366 is 663122742.

It is a super-2 number, since 2×247221366² = 122236807613811912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247221367) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1887121 + ... + 1887251.

Almost surely, 2^247221366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247221366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290626158).

247221366 is an abundant number, since it is smaller than the sum of its proper divisors (334030950).

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

247221366 is an frugal number, since it uses more digits than its factorization.

247221366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295 (or 143 counting only the distinct ones).

The product of its digits is 24192, while the sum is 33.

The square root of 247221366 is about 15723.2746589252. The cubic root of 247221366 is about 627.6179180841.

The spelling of 247221366 in words is "two hundred forty-seven million, two hundred twenty-one thousand, three hundred sixty-six".