21481426 has 8 divisors (see below), whose sum is σ = 32554620. Its totient is φ = 10629888.

The previous prime is 21481409. The next prime is 21481459. The reversal of 21481426 is 62418412.

It can be written as a sum of positive squares in 2 ways, for example, as 21150801 + 330625 = 4599^2 + 575^2 .

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

It is a super-2 number, since 2×21481426² = 922903325986952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21481394 and 21481403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55171 + ... + 55558.

Almost surely, 2^21481426 is an apocalyptic number.

21481426 is a deficient number, since it is larger than the sum of its proper divisors (11073194).

21481426 is a wasteful number, since it uses less digits than its factorization.

21481426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110828.

The product of its digits is 3072, while the sum is 28.

The square root of 21481426 is about 4634.8059290546. The cubic root of 21481426 is about 277.9847911905.

Adding to 21481426 its reverse (62418412), we get a palindrome (83899838).

It can be divided in two parts, 214814 and 26, that added together give a triangular number (214840 = T₆₅₅).

The spelling of 21481426 in words is "twenty-one million, four hundred eighty-one thousand, four hundred twenty-six".