221394490 has 8 divisors (see below), whose sum is σ = 398510100. Its totient is φ = 88557792.

The previous prime is 221394469. The next prime is 221394499. The reversal of 221394490 is 94493122.

221394490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 194239969 + 27154521 = 13937^2 + 5211^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221394499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11069715 + ... + 11069734.

Almost surely, 2^221394490 is an apocalyptic number.

221394490 is a deficient number, since it is larger than the sum of its proper divisors (177115610).

221394490 is a wasteful number, since it uses less digits than its factorization.

221394490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22139456.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 221394490 is about 14879.3309661423. The cubic root of 221394490 is about 604.9538839698.

The spelling of 221394490 in words is "two hundred twenty-one million, three hundred ninety-four thousand, four hundred ninety".