221423115 has 16 divisors (see below), whose sum is σ = 354993408. Its totient is φ = 117853536.

The previous prime is 221423101. The next prime is 221423123. The reversal of 221423115 is 511324122.

It is not a de Polignac number, because 221423115 - 2¹⁹ = 220898827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221423091 and 221423100.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 7129 + ... + 22218.

It is an arithmetic number, because the mean of its divisors is an integer number (22187088).

Almost surely, 2^221423115 is an apocalyptic number.

221423115 is a deficient number, since it is larger than the sum of its proper divisors (133570293).

221423115 is a wasteful number, since it uses less digits than its factorization.

221423115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29858.

The product of its digits is 480, while the sum is 21.

The square root of 221423115 is about 14880.2928398604. The cubic root of 221423115 is about 604.9799551677.

Adding to 221423115 its reverse (511324122), we get a palindrome (732747237).

The spelling of 221423115 in words is "two hundred twenty-one million, four hundred twenty-three thousand, one hundred fifteen".