21063426 has 32 divisors (see below), whose sum is σ = 43469568. Its totient is φ = 6800640.

The previous prime is 21063403. The next prime is 21063451. The reversal of 21063426 is 62436012.

21063426 = T₅₀ + T₅₁ + ... + T₅₀₁.

It is a junction number, because it is equal to n+sod(n) for n = 21063396 and 21063405.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31536 + ... + 32196.

It is an arithmetic number, because the mean of its divisors is an integer number (1358424).

Almost surely, 2^21063426 is an apocalyptic number.

21063426 is an abundant number, since it is smaller than the sum of its proper divisors (22406142).

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

21063426 is a wasteful number, since it uses less digits than its factorization.

21063426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 21063426 is about 4589.4908214311. The cubic root of 21063426 is about 276.1698964461.

Adding to 21063426 its reverse (62436012), we get a palindrome (83499438).

It can be divided in two parts, 210 and 63426, that added together give a palindrome (63636).

The spelling of 21063426 in words is "twenty-one million, sixty-three thousand, four hundred twenty-six".