1227630421 has 2 divisors, whose sum is σ = 1227630422. Its totient is φ = 1227630420.

The previous prime is 1227630409. The next prime is 1227630427. The reversal of 1227630421 is 1240367221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 796029796 + 431600625 = 28214^2 + 20775^2 .

It is an emirp because it is prime and its reverse (1240367221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1227630421 - 2⁷ = 1227630293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1227630421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1227630427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613815210 + 613815211.

It is an arithmetic number, because the mean of its divisors is an integer number (613815211).

Almost surely, 2^1227630421 is an apocalyptic number.

It is an amenable number.

1227630421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227630421 is an equidigital number, since it uses as much as digits as its factorization.

1227630421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1227630421 is about 35037.5572921401. The cubic root of 1227630421 is about 1070.7527881615.

Adding to 1227630421 its reverse (1240367221), we get a palindrome (2467997642).

The spelling of 1227630421 in words is "one billion, two hundred twenty-seven million, six hundred thirty thousand, four hundred twenty-one".