1221427301 has 2 divisors, whose sum is σ = 1221427302. Its totient is φ = 1221427300.

The previous prime is 1221427289. The next prime is 1221427303. The reversal of 1221427301 is 1037241221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218708100 + 2719201 = 34910^2 + 1649^2 .

It is an emirp because it is prime and its reverse (1037241221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221427301 - 2²⁶ = 1154318437 is a prime.

Together with 1221427303, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221427303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610713650 + 610713651.

It is an arithmetic number, because the mean of its divisors is an integer number (610713651).

Almost surely, 2^1221427301 is an apocalyptic number.

It is an amenable number.

1221427301 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221427301 is an equidigital number, since it uses as much as digits as its factorization.

1221427301 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1221427301 is about 34948.9241751445. The cubic root of 1221427301 is about 1068.9462654455.

Adding to 1221427301 its reverse (1037241221), we get a palindrome (2258668522).

The spelling of 1221427301 in words is "one billion, two hundred twenty-one million, four hundred twenty-seven thousand, three hundred one".