21055366 has 8 divisors (see below), whose sum is σ = 31623984. Its totient is φ = 10514040.

The previous prime is 21055351. The next prime is 21055379. The reversal of 21055366 is 66355012.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4770 + ... + 8053.

It is an arithmetic number, because the mean of its divisors is an integer number (3952998).

Almost surely, 2^21055366 is an apocalyptic number.

21055366 is a deficient number, since it is larger than the sum of its proper divisors (10568618).

21055366 is a wasteful number, since it uses less digits than its factorization.

21055366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13646.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 21055366 is about 4588.6126443621. The cubic root of 21055366 is about 276.1346661320.

The spelling of 21055366 in words is "twenty-one million, fifty-five thousand, three hundred sixty-six".