21495506 has 8 divisors (see below), whose sum is σ = 32631984. Its totient is φ = 10618180.

The previous prime is 21495503. The next prime is 21495541. The reversal of 21495506 is 60559412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21495503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64580 + ... + 64911.

It is an arithmetic number, because the mean of its divisors is an integer number (4078998).

Almost surely, 2^21495506 is an apocalyptic number.

21495506 is a deficient number, since it is larger than the sum of its proper divisors (11136478).

21495506 is a wasteful number, since it uses less digits than its factorization.

21495506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129576.

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

The square root of 21495506 is about 4636.3246219392. The cubic root of 21495506 is about 278.0455129666.

The spelling of 21495506 in words is "twenty-one million, four hundred ninety-five thousand, five hundred six".