21112055 has 8 divisors (see below), whose sum is σ = 25481952. Its totient is φ = 16791328.

The previous prime is 21112043. The next prime is 21112061. The reversal of 21112055 is 55021112.

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 21112055 - 2⁶ = 21111991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11339 + ... + 13068.

It is an arithmetic number, because the mean of its divisors is an integer number (3185244).

Almost surely, 2^21112055 is an apocalyptic number.

21112055 is a deficient number, since it is larger than the sum of its proper divisors (4369897).

21112055 is a wasteful number, since it uses less digits than its factorization.

21112055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24585.

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 21112055 is about 4594.7856315611. The cubic root of 21112055 is about 276.3822636710.

Adding to 21112055 its reverse (55021112), we get a palindrome (76133167).

The spelling of 21112055 in words is "twenty-one million, one hundred twelve thousand, fifty-five".