221949450 has 192 divisors, whose sum is σ = 682992000. Its totient is φ = 52669440.

The previous prime is 221949437. The next prime is 221949457. The reversal of 221949450 is 54949122.

221949450 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221949457) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 435796 + ... + 436304.

It is an arithmetic number, because the mean of its divisors is an integer number (3557250).

Almost surely, 2^221949450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221949450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (341496000).

221949450 is an abundant number, since it is smaller than the sum of its proper divisors (461042550).

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

221949450 is a wasteful number, since it uses less digits than its factorization.

221949450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 221949450 is about 14897.9679822451. The cubic root of 221949450 is about 605.4589327954.

The spelling of 221949450 in words is "two hundred twenty-one million, nine hundred forty-nine thousand, four hundred fifty".