21470655 has 8 divisors (see below), whose sum is σ = 34353072. Its totient is φ = 11451008.

The previous prime is 21470653. The next prime is 21470723. The reversal of 21470655 is 55607412.

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 21470655 - 2¹ = 21470653 is a prime.

It is a super-2 number, since 2×21470655² = 921978052258050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470651) by changing a digit.

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, 715674 + ... + 715703.

It is an arithmetic number, because the mean of its divisors is an integer number (4294134).

Almost surely, 2^21470655 is an apocalyptic number.

21470655 is a deficient number, since it is larger than the sum of its proper divisors (12882417).

21470655 is a wasteful number, since it uses less digits than its factorization.

21470655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431385.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 21470655 is about 4633.6438145373. The cubic root of 21470655 is about 277.9383219793.

The spelling of 21470655 in words is "twenty-one million, four hundred seventy thousand, six hundred fifty-five".