1427170421 has 2 divisors, whose sum is σ = 1427170422. Its totient is φ = 1427170420.

The previous prime is 1427170403. The next prime is 1427170453. The reversal of 1427170421 is 1240717241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 979001521 + 448168900 = 31289^2 + 21170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1427170421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1427170321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 713585210 + 713585211.

It is an arithmetic number, because the mean of its divisors is an integer number (713585211).

Almost surely, 2^1427170421 is an apocalyptic number.

It is an amenable number.

1427170421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1427170421 is an equidigital number, since it uses as much as digits as its factorization.

1427170421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 1427170421 is about 37777.9091666016. The cubic root of 1427170421 is about 1125.8795876000.

Adding to 1427170421 its reverse (1240717241), we get a palindrome (2667887662).

The spelling of 1427170421 in words is "one billion, four hundred twenty-seven million, one hundred seventy thousand, four hundred twenty-one".