221814813 has 8 divisors (see below), whose sum is σ = 322639776. Its totient is φ = 134433200.

The previous prime is 221814811. The next prime is 221814821. The reversal of 221814813 is 318418122.

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

It is not a de Polignac number, because 221814813 - 2¹ = 221814811 is a prime.

It is a super-2 number, since 2×221814813² = 98403622532449938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221814811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3360798 + ... + 3360863.

It is an arithmetic number, because the mean of its divisors is an integer number (40329972).

Almost surely, 2^221814813 is an apocalyptic number.

It is an amenable number.

221814813 is a deficient number, since it is larger than the sum of its proper divisors (100824963).

221814813 is a wasteful number, since it uses less digits than its factorization.

221814813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721675.

The product of its digits is 3072, while the sum is 30.

The square root of 221814813 is about 14893.4486604010. The cubic root of 221814813 is about 605.3364819956.

The spelling of 221814813 in words is "two hundred twenty-one million, eight hundred fourteen thousand, eight hundred thirteen".