21054695 has 16 divisors (see below), whose sum is σ = 25878528. Its totient is φ = 16440480.

The previous prime is 21054661. The next prime is 21054697. The reversal of 21054695 is 59645012.

It is a happy number.

It is not a de Polignac number, because 21054695 - 2²⁴ = 4277479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21054697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44852 + ... + 45318.

It is an arithmetic number, because the mean of its divisors is an integer number (1617408).

Almost surely, 2^21054695 is an apocalyptic number.

21054695 is a deficient number, since it is larger than the sum of its proper divisors (4823833).

21054695 is a wasteful number, since it uses less digits than its factorization.

21054695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 21054695 is about 4588.5395279980. The cubic root of 21054695 is about 276.1317327811.

The spelling of 21054695 in words is "twenty-one million, fifty-four thousand, six hundred ninety-five".