1463720221 has 2 divisors, whose sum is σ = 1463720222. Its totient is φ = 1463720220.

The previous prime is 1463720197. The next prime is 1463720227. The reversal of 1463720221 is 1220273641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1463062500 + 657721 = 38250^2 + 811^2 .

It is an emirp because it is prime and its reverse (1220273641) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1463720221 - 2¹⁵ = 1463687453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1463720221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1463720227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 731860110 + 731860111.

It is an arithmetic number, because the mean of its divisors is an integer number (731860111).

Almost surely, 2^1463720221 is an apocalyptic number.

It is an amenable number.

1463720221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1463720221 is an equidigital number, since it uses as much as digits as its factorization.

1463720221 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 1463720221 is about 38258.5966940765. The cubic root of 1463720221 is about 1135.4099371166.

Adding to 1463720221 its reverse (1220273641), we get a palindrome (2683993862).

The spelling of 1463720221 in words is "one billion, four hundred sixty-three million, seven hundred twenty thousand, two hundred twenty-one".