21051095 has 16 divisors (see below), whose sum is σ = 28389312. Its totient is φ = 14868480.

The previous prime is 21051091. The next prime is 21051101. The reversal of 21051095 is 59015012.

It is not a de Polignac number, because 21051095 - 2² = 21051091 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

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 21051095.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051091) 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 15 ways as a sum of consecutive naturals, for example, 5546 + ... + 8535.

It is an arithmetic number, because the mean of its divisors is an integer number (1774332).

Almost surely, 2^21051095 is an apocalyptic number.

21051095 is a deficient number, since it is larger than the sum of its proper divisors (7338217).

21051095 is a wasteful number, since it uses less digits than its factorization.

21051095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14122.

The product of its (nonzero) digits is 450, while the sum is 23.

The square root of 21051095 is about 4588.1472295470. The cubic root of 21051095 is about 276.1159939178.

The spelling of 21051095 in words is "twenty-one million, fifty-one thousand, ninety-five".