221345413 has 2 divisors, whose sum is σ = 221345414. Its totient is φ = 221345412.

The previous prime is 221345387. The next prime is 221345431. The reversal of 221345413 is 314543122.

221345413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with next prime (221345431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137311524 + 84033889 = 11718^2 + 9167^2 .

It is a cyclic number.

It is not a de Polignac number, because 221345413 - 2²¹ = 219248261 is a prime.

It is a super-2 number, since 2×221345413² = 97987583712281138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221345713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110672706 + 110672707.

It is an arithmetic number, because the mean of its divisors is an integer number (110672707).

Almost surely, 2^221345413 is an apocalyptic number.

It is an amenable number.

221345413 is a deficient number, since it is larger than the sum of its proper divisors (1).

221345413 is an equidigital number, since it uses as much as digits as its factorization.

221345413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 221345413 is about 14877.6817078468. The cubic root of 221345413 is about 604.9091801837.

Adding to 221345413 its reverse (314543122), we get a palindrome (535888535).

The spelling of 221345413 in words is "two hundred twenty-one million, three hundred forty-five thousand, four hundred thirteen".