1424751221 has 2 divisors, whose sum is σ = 1424751222. Its totient is φ = 1424751220.

The previous prime is 1424751173. The next prime is 1424751253. The reversal of 1424751221 is 1221574241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1374184900 + 50566321 = 37070^2 + 7111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1424751221 - 2²⁶ = 1357642357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1424751281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 712375610 + 712375611.

It is an arithmetic number, because the mean of its divisors is an integer number (712375611).

Almost surely, 2^1424751221 is an apocalyptic number.

It is an amenable number.

1424751221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1424751221 is an equidigital number, since it uses as much as digits as its factorization.

1424751221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 29.

The square root of 1424751221 is about 37745.8768741700. The cubic root of 1424751221 is about 1125.2430674132.

The spelling of 1424751221 in words is "one billion, four hundred twenty-four million, seven hundred fifty-one thousand, two hundred twenty-one".