221010451 has 4 divisors (see below), whose sum is σ = 232642600. Its totient is φ = 209378304.

The previous prime is 221010431. The next prime is 221010463. The reversal of 221010451 is 154010122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221010451 - 2⁷ = 221010323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221010431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5816046 + ... + 5816083.

It is an arithmetic number, because the mean of its divisors is an integer number (58160650).

Almost surely, 2^221010451 is an apocalyptic number.

221010451 is a deficient number, since it is larger than the sum of its proper divisors (11632149).

221010451 is a wasteful number, since it uses less digits than its factorization.

221010451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11632148.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 221010451 is about 14866.4202483315. The cubic root of 221010451 is about 604.6038897914.

Adding to 221010451 its reverse (154010122), we get a palindrome (375020573).

The spelling of 221010451 in words is "two hundred twenty-one million, ten thousand, four hundred fifty-one".