221040427 has 2 divisors, whose sum is σ = 221040428. Its totient is φ = 221040426.

The previous prime is 221040403. The next prime is 221040439. The reversal of 221040427 is 724040122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221040427 - 2⁷ = 221040299 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 221040398 and 221040407.

It is not a weakly prime, because it can be changed into another prime (221040467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110520213 + 110520214.

It is an arithmetic number, because the mean of its divisors is an integer number (110520214).

Almost surely, 2^221040427 is an apocalyptic number.

221040427 is a deficient number, since it is larger than the sum of its proper divisors (1).

221040427 is an equidigital number, since it uses as much as digits as its factorization.

221040427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 22.

The square root of 221040427 is about 14867.4283922943. The cubic root of 221040427 is about 604.6312230190.

Adding to 221040427 its reverse (724040122), we get a palindrome (945080549).

The spelling of 221040427 in words is "two hundred twenty-one million, forty thousand, four hundred twenty-seven".