221348280 has 32 divisors (see below), whose sum is σ = 664045200. Its totient is φ = 59026176.

The previous prime is 221348273. The next prime is 221348287. The reversal of 221348280 is 82843122.

It is an interprime number because it is at equal distance from previous prime (221348273) and next prime (221348287).

It is a super-2 number, since 2×221348280² = 97990122117916800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221348287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922165 + ... + 922404.

Almost surely, 2^221348280 is an apocalyptic number.

221348280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221348280 is an abundant number, since it is smaller than the sum of its proper divisors (442696920).

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

221348280 is a wasteful number, since it uses less digits than its factorization.

221348280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1844583 (or 1844579 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 221348280 is about 14877.7780599120. The cubic root of 221348280 is about 604.9117918892.

The spelling of 221348280 in words is "two hundred twenty-one million, three hundred forty-eight thousand, two hundred eighty".