21114555 has 64 divisors (see below), whose sum is σ = 42771456. Its totient is φ = 8640000.

The previous prime is 21114551. The next prime is 21114557. The reversal of 21114555 is 55541112.

It is not a de Polignac number, because 21114555 - 2² = 21114551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21114551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 116565 + ... + 116745.

It is an arithmetic number, because the mean of its divisors is an integer number (668304).

Almost surely, 2^21114555 is an apocalyptic number.

21114555 is an abundant number, since it is smaller than the sum of its proper divisors (21656901).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21114555 is a wasteful number, since it uses less digits than its factorization.

21114555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308.

The product of its digits is 1000, while the sum is 24.

The square root of 21114555 is about 4595.0576710200. The cubic root of 21114555 is about 276.3931725789.

Adding to 21114555 its reverse (55541112), we get a palindrome (76655667).

It can be divided in two parts, 2111 and 4555, that added together give a palindrome (6666).

The spelling of 21114555 in words is "twenty-one million, one hundred fourteen thousand, five hundred fifty-five".