221451074 has 8 divisors (see below), whose sum is σ = 357728700. Its totient is φ = 102208176.

The previous prime is 221451037. The next prime is 221451079. The reversal of 221451074 is 470154122.

It can be written as a sum of positive squares in 2 ways, for example, as 185150449 + 36300625 = 13607^2 + 6025^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 8517349 = 221451074 / (2 + 2 + 1 + 4 + 5 + 1 + 0 + 7 + 4).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221451079) 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, 4258649 + ... + 4258700.

Almost surely, 2^221451074 is an apocalyptic number.

221451074 is a deficient number, since it is larger than the sum of its proper divisors (136277626).

221451074 is a wasteful number, since it uses less digits than its factorization.

221451074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8517364.

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 221451074 is about 14881.2322742440. The cubic root of 221451074 is about 605.0054176142.

The spelling of 221451074 in words is "two hundred twenty-one million, four hundred fifty-one thousand, seventy-four".