21867055 has 16 divisors (see below), whose sum is σ = 30274560. Its totient is φ = 14851872.

The previous prime is 21867047. The next prime is 21867067. The reversal of 21867055 is 55076812.

It is not a de Polignac number, because 21867055 - 2³ = 21867047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21867055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 826 + ... + 6664.

It is an arithmetic number, because the mean of its divisors is an integer number (1892160).

Almost surely, 2^21867055 is an apocalyptic number.

21867055 is a deficient number, since it is larger than the sum of its proper divisors (8407505).

21867055 is a wasteful number, since it uses less digits than its factorization.

21867055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5958.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 21867055 is about 4676.2223001051. Note that the first 3 decimals coincide. The cubic root of 21867055 is about 279.6383724350.

The spelling of 21867055 in words is "twenty-one million, eight hundred sixty-seven thousand, fifty-five".