21248007 has 8 divisors (see below), whose sum is σ = 30906240. Its totient is φ = 12877560.

The previous prime is 21247999. The next prime is 21248009. The reversal of 21248007 is 70084212.

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

It is not a de Polignac number, because 21248007 - 2³ = 21247999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21248009) 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, 321907 + ... + 321972.

It is an arithmetic number, because the mean of its divisors is an integer number (3863280).

Almost surely, 2^21248007 is an apocalyptic number.

21248007 is a deficient number, since it is larger than the sum of its proper divisors (9658233).

21248007 is a wasteful number, since it uses less digits than its factorization.

21248007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643893.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 21248007 is about 4609.5560523764. The cubic root of 21248007 is about 276.9742533208.

The spelling of 21248007 in words is "twenty-one million, two hundred forty-eight thousand, seven".