21097486 has 32 divisors (see below), whose sum is σ = 35251200. Its totient is φ = 9424800.

The previous prime is 21097481. The next prime is 21097487. The reversal of 21097486 is 68479012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097481) 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, 88155 + ... + 88393.

It is an arithmetic number, because the mean of its divisors is an integer number (1101600).

Almost surely, 2^21097486 is an apocalyptic number.

21097486 is a deficient number, since it is larger than the sum of its proper divisors (14153714).

21097486 is a wasteful number, since it uses less digits than its factorization.

21097486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 21097486 is about 4593.1999738744. The cubic root of 21097486 is about 276.3186737808.

The spelling of 21097486 in words is "twenty-one million, ninety-seven thousand, four hundred eighty-six".