21435419 has 8 divisors (see below), whose sum is σ = 22780080. Its totient is φ = 20169888.

The previous prime is 21435409. The next prime is 21435443. The reversal of 21435419 is 91453412.

It is not a de Polignac number, because 21435419 - 2⁸ = 21435163 is a prime.

It is a super-2 number, since 2×21435419² = 918954375411122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21435391 and 21435400.

It is not an unprimeable number, because it can be changed into a prime (21435409) 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 in 7 ways as a sum of consecutive naturals, for example, 2732 + ... + 7094.

It is an arithmetic number, because the mean of its divisors is an integer number (2847510).

Almost surely, 2^21435419 is an apocalyptic number.

21435419 is a deficient number, since it is larger than the sum of its proper divisors (1344661).

21435419 is an frugal number, since it uses more digits than its factorization.

21435419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4414 (or 4380 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 21435419 is about 4629.8400620324. The cubic root of 21435419 is about 277.7861950101.

The spelling of 21435419 in words is "twenty-one million, four hundred thirty-five thousand, four hundred nineteen".