21026055 has 8 divisors (see below), whose sum is σ = 33641712. Its totient is φ = 11213888.

The previous prime is 21026053. The next prime is 21026063. The reversal of 21026055 is 55062012.

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 21026055 - 2¹ = 21026053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21026053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 700854 + ... + 700883.

It is an arithmetic number, because the mean of its divisors is an integer number (4205214).

Almost surely, 2^21026055 is an apocalyptic number.

21026055 is a deficient number, since it is larger than the sum of its proper divisors (12615657).

21026055 is a wasteful number, since it uses less digits than its factorization.

21026055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1401745.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 21026055 is about 4585.4176472814. The cubic root of 21026055 is about 276.0064717029.

Adding to 21026055 its reverse (55062012), we get a palindrome (76088067).

The spelling of 21026055 in words is "twenty-one million, twenty-six thousand, fifty-five".