21441426 has 32 divisors (see below), whose sum is σ = 44815680. Its totient is φ = 6831936.

The previous prime is 21441421. The next prime is 21441449. The reversal of 21441426 is 62414412.

It is a happy number.

21441426 is a nontrivial binomial coefficient, being equal to C(6549, 2).

It is a junction number, because it is equal to n+sod(n) for n = 21441396 and 21441405.

It is not an unprimeable number, because it can be changed into a prime (21441421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12280 + ... + 13916.

It is an arithmetic number, because the mean of its divisors is an integer number (1400490).

Almost surely, 2^21441426 is an apocalyptic number.

21441426 is the 6548-th triangular number.

21441426 is an abundant number, since it is smaller than the sum of its proper divisors (23374254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21441426 is a wasteful number, since it uses less digits than its factorization.

21441426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1738.

The product of its digits is 1536, while the sum is 24.

The square root of 21441426 is about 4630.4887431026. The cubic root of 21441426 is about 277.8121412540.

Adding to 21441426 its reverse (62414412), we get a palindrome (83855838).

It can be divided in two parts, 2144 and 1426, that added together give a triangular number (3570 = T₈₄).

The spelling of 21441426 in words is "twenty-one million, four hundred forty-one thousand, four hundred twenty-six".