21490695 has 12 divisors (see below), whose sum is σ = 37250616. Its totient is φ = 11461680.

The previous prime is 21490687. The next prime is 21490697. The reversal of 21490695 is 59609412.

It is not a de Polignac number, because 21490695 - 2³ = 21490687 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21490697) 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 11 ways as a sum of consecutive naturals, for example, 238741 + ... + 238830.

It is an arithmetic number, because the mean of its divisors is an integer number (3104218).

Almost surely, 2^21490695 is an apocalyptic number.

21490695 is a deficient number, since it is larger than the sum of its proper divisors (15759921).

21490695 is a wasteful number, since it uses less digits than its factorization.

21490695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477582 (or 477579 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 21490695 is about 4635.8057552059. The cubic root of 21490695 is about 278.0247679053.

It can be divided in two parts, 214 and 90695, that added together give a palindrome (90909).

The spelling of 21490695 in words is "twenty-one million, four hundred ninety thousand, six hundred ninety-five".