1221427 has 2 divisors, whose sum is σ = 1221428. Its totient is φ = 1221426.

The previous prime is 1221421. The next prime is 1221443. The reversal of 1221427 is 7241221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221427 - 2⁷ = 1221299 is a prime.

1221427 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1221421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610713 + 610714.

It is an arithmetic number, because the mean of its divisors is an integer number (610714).

2^1221427 is an apocalyptic number.

1221427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221427 is an equidigital number, since it uses as much as digits as its factorization.

1221427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 224, while the sum is 19.

The square root of 1221427 is about 1105.1818854831. The cubic root of 1221427 is about 106.8946177638.

Adding to 1221427 its reverse (7241221), we get a palindrome (8462648).

The spelling of 1221427 in words is "one million, two hundred twenty-one thousand, four hundred twenty-seven".