21496506 has 16 divisors (see below), whose sum is σ = 43039200. Its totient is φ = 7157808.

The previous prime is 21496499. The next prime is 21496507. The reversal of 21496506 is 60569412.

It is not an unprimeable number, because it can be changed into a prime (21496507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8340 + ... + 10608.

It is an arithmetic number, because the mean of its divisors is an integer number (2689950).

Almost surely, 2^21496506 is an apocalyptic number.

21496506 is an abundant number, since it is smaller than the sum of its proper divisors (21542694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21496506 is a wasteful number, since it uses less digits than its factorization.

21496506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3853.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 21496506 is about 4636.4324647298. The cubic root of 21496506 is about 278.0498245841.

The spelling of 21496506 in words is "twenty-one million, four hundred ninety-six thousand, five hundred six".