21887055 has 12 divisors (see below), whose sum is σ = 37937640. Its totient is φ = 11673072.

The previous prime is 21886999. The next prime is 21887081. The reversal of 21887055 is 55078812.

It is not a de Polignac number, because 21887055 - 2⁷ = 21886927 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 243145 + ... + 243234.

It is an arithmetic number, because the mean of its divisors is an integer number (3161470).

Almost surely, 2^21887055 is an apocalyptic number.

21887055 is a deficient number, since it is larger than the sum of its proper divisors (16050585).

21887055 is a wasteful number, since it uses less digits than its factorization.

21887055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486390 (or 486387 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 21887055 is about 4678.3602896742. The cubic root of 21887055 is about 279.7236005439.

The spelling of 21887055 in words is "twenty-one million, eight hundred eighty-seven thousand, fifty-five".