221412807 has 24 divisors (see below), whose sum is σ = 398736000. Its totient is φ = 115019280.

The previous prime is 221412803. The next prime is 221412809. The reversal of 221412807 is 708214122.

It is not a de Polignac number, because 221412807 - 2² = 221412803 is a prime.

It is a super-2 number, since 2×221412807² = 98047262207238498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221412803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159057 + ... + 160442.

It is an arithmetic number, because the mean of its divisors is an integer number (16614000).

Almost surely, 2^221412807 is an apocalyptic number.

221412807 is a deficient number, since it is larger than the sum of its proper divisors (177323193).

221412807 is a wasteful number, since it uses less digits than its factorization.

221412807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319523 (or 319520 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 221412807 is about 14879.9464716779. The cubic root of 221412807 is about 604.9705670630.

Adding to 221412807 its reverse (708214122), we get a palindrome (929626929).

The spelling of 221412807 in words is "two hundred twenty-one million, four hundred twelve thousand, eight hundred seven".