1421665241 has 2 divisors, whose sum is σ = 1421665242. Its totient is φ = 1421665240.

The previous prime is 1421665229. The next prime is 1421665243. The reversal of 1421665241 is 1425661241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1401379225 + 20286016 = 37435^2 + 4504^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421665241 is a prime.

It is a super-2 number, since 2×1421665241² = 4042264114935176162, which contains 22 as substring.

Together with 1421665243, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421665198 and 1421665207.

It is not a weakly prime, because it can be changed into another prime (1421665243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710832620 + 710832621.

It is an arithmetic number, because the mean of its divisors is an integer number (710832621).

Almost surely, 2^1421665241 is an apocalyptic number.

It is an amenable number.

1421665241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421665241 is an equidigital number, since it uses as much as digits as its factorization.

1421665241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 1421665241 is about 37704.9763426527. The cubic root of 1421665241 is about 1124.4300628515.

The spelling of 1421665241 in words is "one billion, four hundred twenty-one million, six hundred sixty-five thousand, two hundred forty-one".