1254420221 has 2 divisors, whose sum is σ = 1254420222. Its totient is φ = 1254420220.

The previous prime is 1254420187. The next prime is 1254420227. The reversal of 1254420221 is 1220244521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 732297721 + 522122500 = 27061^2 + 22850^2 .

It is an emirp because it is prime and its reverse (1220244521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1254420221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1254420227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627210110 + 627210111.

It is an arithmetic number, because the mean of its divisors is an integer number (627210111).

Almost surely, 2^1254420221 is an apocalyptic number.

It is an amenable number.

1254420221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254420221 is an equidigital number, since it uses as much as digits as its factorization.

1254420221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1254420221 is about 35417.7952588808. The cubic root of 1254420221 is about 1078.4855949313.

Adding to 1254420221 its reverse (1220244521), we get a palindrome (2474664742).

The spelling of 1254420221 in words is "one billion, two hundred fifty-four million, four hundred twenty thousand, two hundred twenty-one".