221013451 has 2 divisors, whose sum is σ = 221013452. Its totient is φ = 221013450.

The previous prime is 221013409. The next prime is 221013497. The reversal of 221013451 is 154310122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221013451 - 2¹¹ = 221011403 is a prime.

It is not a weakly prime, because it can be changed into another prime (221013151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110506725 + 110506726.

It is an arithmetic number, because the mean of its divisors is an integer number (110506726).

Almost surely, 2^221013451 is an apocalyptic number.

221013451 is a deficient number, since it is larger than the sum of its proper divisors (1).

221013451 is an equidigital number, since it uses as much as digits as its factorization.

221013451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 221013451 is about 14866.5211465225. The cubic root of 221013451 is about 604.6066254138.

Adding to 221013451 its reverse (154310122), we get a palindrome (375323573).

It can be divided in two parts, 22101 and 3451, that added together give a palindrome (25552).

The spelling of 221013451 in words is "two hundred twenty-one million, thirteen thousand, four hundred fifty-one".