21554126 has 16 divisors (see below), whose sum is σ = 35756208. Its totient is φ = 9662400.

The previous prime is 21554111. The next prime is 21554149. The reversal of 21554126 is 62145512.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21554095 and 21554104.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5105 + ... + 8316.

It is an arithmetic number, because the mean of its divisors is an integer number (2234763).

Almost surely, 2^21554126 is an apocalyptic number.

21554126 is a deficient number, since it is larger than the sum of its proper divisors (14202082).

21554126 is a wasteful number, since it uses less digits than its factorization.

21554126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13507.

The product of its digits is 2400, while the sum is 26.

The square root of 21554126 is about 4642.6421356809. The cubic root of 21554126 is about 278.2980344955.

Adding to 21554126 its reverse (62145512), we get a palindrome (83699638).

The spelling of 21554126 in words is "twenty-one million, five hundred fifty-four thousand, one hundred twenty-six".