21413426 has 8 divisors (see below), whose sum is σ = 33227820. Its totient is φ = 10337488.

The previous prime is 21413423. The next prime is 21413443. The reversal of 21413426 is 62431412.

It can be written as a sum of positive squares in 2 ways, for example, as 21390625 + 22801 = 4625^2 + 151^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21413423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184541 + ... + 184656.

Almost surely, 2^21413426 is an apocalyptic number.

21413426 is a deficient number, since it is larger than the sum of its proper divisors (11814394).

21413426 is a wasteful number, since it uses less digits than its factorization.

21413426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369228.

The product of its digits is 1152, while the sum is 23.

The square root of 21413426 is about 4627.4643164480. The cubic root of 21413426 is about 277.6911584976.

Adding to 21413426 its reverse (62431412), we get a palindrome (83844838).

The spelling of 21413426 in words is "twenty-one million, four hundred thirteen thousand, four hundred twenty-six".