21655126 has 8 divisors (see below), whose sum is σ = 32507784. Its totient is φ = 10819200.

The previous prime is 21655099. The next prime is 21655129. The reversal of 21655126 is 62155612.

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

It is a junction number, because it is equal to n+sod(n) for n = 21655094 and 21655103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655129) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 180 + ... + 6583.

It is an arithmetic number, because the mean of its divisors is an integer number (4063473).

Almost surely, 2^21655126 is an apocalyptic number.

21655126 is a deficient number, since it is larger than the sum of its proper divisors (10852658).

21655126 is a wasteful number, since it uses less digits than its factorization.

21655126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8366.

The product of its digits is 3600, while the sum is 28.

The square root of 21655126 is about 4653.5068496780. The cubic root of 21655126 is about 278.7320474808.

The spelling of 21655126 in words is "twenty-one million, six hundred fifty-five thousand, one hundred twenty-six".