21626055 has 32 divisors (see below), whose sum is σ = 41944320. Its totient is φ = 10484640.

The previous prime is 21626051. The next prime is 21626131. The reversal of 21626055 is 55062612.

It is not a de Polignac number, because 21626055 - 2² = 21626051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21626051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5797 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (1310760).

Almost surely, 2^21626055 is an apocalyptic number.

21626055 is a deficient number, since it is larger than the sum of its proper divisors (20318265).

21626055 is a wasteful number, since it uses less digits than its factorization.

21626055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14588 (or 14582 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 21626055 is about 4650.3822423538. The cubic root of 21626055 is about 278.6072633529.

Adding to 21626055 its reverse (55062612), we get a palindrome (76688667).

The spelling of 21626055 in words is "twenty-one million, six hundred twenty-six thousand, fifty-five".