21477055 has 8 divisors (see below), whose sum is σ = 26893152. Its totient is φ = 16434528.

The previous prime is 21477041. The next prime is 21477077. The reversal of 21477055 is 55077412.

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

It is a cyclic number.

It is not a de Polignac number, because 21477055 - 2⁷ = 21476927 is a prime.

It is a super-2 number, since 2×21477055² = 922527782946050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93264 + ... + 93493.

It is an arithmetic number, because the mean of its divisors is an integer number (3361644).

Almost surely, 2^21477055 is an apocalyptic number.

21477055 is a deficient number, since it is larger than the sum of its proper divisors (5416097).

21477055 is a wasteful number, since it uses less digits than its factorization.

21477055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186785.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 21477055 is about 4634.3343642858. The cubic root of 21477055 is about 277.9659353047.

The spelling of 21477055 in words is "twenty-one million, four hundred seventy-seven thousand, fifty-five".