21487695 has 32 divisors (see below), whose sum is σ = 36357120. Its totient is φ = 10819200.

The previous prime is 21487693. The next prime is 21487699. The reversal of 21487695 is 59678412.

It is not a de Polignac number, because 21487695 - 2¹ = 21487693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21487693) 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 31 ways as a sum of consecutive naturals, for example, 19920 + ... + 20970.

It is an arithmetic number, because the mean of its divisors is an integer number (1136160).

Almost surely, 2^21487695 is an apocalyptic number.

21487695 is a deficient number, since it is larger than the sum of its proper divisors (14869425).

21487695 is a wasteful number, since it uses less digits than its factorization.

21487695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1135.

The product of its digits is 120960, while the sum is 42.

The square root of 21487695 is about 4635.4821755671. The cubic root of 21487695 is about 278.0118303197.

The spelling of 21487695 in words is "twenty-one million, four hundred eighty-seven thousand, six hundred ninety-five".