21263126 has 8 divisors (see below), whose sum is σ = 32210784. Its totient is φ = 10526200.

The previous prime is 21263093. The next prime is 21263149. The reversal of 21263126 is 62136212.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 52430 + ... + 52833.

It is an arithmetic number, because the mean of its divisors is an integer number (4026348).

Almost surely, 2^21263126 is an apocalyptic number.

21263126 is a deficient number, since it is larger than the sum of its proper divisors (10947658).

21263126 is a wasteful number, since it uses less digits than its factorization.

21263126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105366.

The product of its digits is 864, while the sum is 23.

The square root of 21263126 is about 4611.1957234540. The cubic root of 21263126 is about 277.0399313380.

Adding to 21263126 its reverse (62136212), we get a palindrome (83399338).

It can be divided in two parts, 2 and 1263126, that multiplied together give a palindrome (2526252).

The spelling of 21263126 in words is "twenty-one million, two hundred sixty-three thousand, one hundred twenty-six".