21054895 has 8 divisors (see below), whose sum is σ = 25331904. Its totient is φ = 16799904.

The previous prime is 21054893. The next prime is 21054923. The reversal of 21054895 is 59845012.

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 21054895 - 2¹ = 21054893 is a prime.

It is a super-2 number, since 2×21054895² = 886617206922050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21054895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3319 + ... + 7288.

It is an arithmetic number, because the mean of its divisors is an integer number (3166488).

Almost surely, 2^21054895 is an apocalyptic number.

21054895 is a deficient number, since it is larger than the sum of its proper divisors (4277009).

21054895 is a wasteful number, since it uses less digits than its factorization.

21054895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11009.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 21054895 is about 4588.5613213730. The cubic root of 21054895 is about 276.1326071098.

The spelling of 21054895 in words is "twenty-one million, fifty-four thousand, eight hundred ninety-five".