221079450 has 48 divisors (see below), whose sum is σ = 572124096. Its totient is φ = 56390400.

The previous prime is 221079413. The next prime is 221079451. The reversal of 221079450 is 54970122.

It is a super-2 number, since 2×221079450² = 97752246424605000, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (221079451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28591 + ... + 35490.

It is an arithmetic number, because the mean of its divisors is an integer number (11919252).

Almost surely, 2^221079450 is an apocalyptic number.

221079450 is an abundant number, since it is smaller than the sum of its proper divisors (351044646).

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

221079450 is a wasteful number, since it uses less digits than its factorization.

221079450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64119 (or 64114 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 221079450 is about 14868.7406998710. The cubic root of 221079450 is about 604.6668019343. Note that the first 3 decimals are identical.

The spelling of 221079450 in words is "two hundred twenty-one million, seventy-nine thousand, four hundred fifty".