424161421 has 2 divisors, whose sum is σ = 424161422. Its totient is φ = 424161420.

The previous prime is 424161391. The next prime is 424161461. The reversal of 424161421 is 124161424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 424154025 + 7396 = 20595^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 424161421 - 2⁷ = 424161293 is a prime.

It is a super-2 number, since 2×424161421² = 359825822129478482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (424161461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 212080710 + 212080711.

It is an arithmetic number, because the mean of its divisors is an integer number (212080711).

Almost surely, 2^424161421 is an apocalyptic number.

It is an amenable number.

424161421 is a deficient number, since it is larger than the sum of its proper divisors (1).

424161421 is an equidigital number, since it uses as much as digits as its factorization.

424161421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 424161421 is about 20595.1795573624. The cubic root of 424161421 is about 751.3524757612.

The spelling of 424161421 in words is "four hundred twenty-four million, one hundred sixty-one thousand, four hundred twenty-one".