21246501 has 8 divisors (see below), whose sum is σ = 29242624. Its totient is φ = 13707360.

The previous prime is 21246499. The next prime is 21246517. The reversal of 21246501 is 10564212.

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

It is not a de Polignac number, because 21246501 - 2¹ = 21246499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246521) 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, 114136 + ... + 114321.

It is an arithmetic number, because the mean of its divisors is an integer number (3655328).

Almost surely, 2^21246501 is an apocalyptic number.

It is an amenable number.

21246501 is a deficient number, since it is larger than the sum of its proper divisors (7996123).

21246501 is a wasteful number, since it uses less digits than its factorization.

21246501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228491.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21246501 is about 4609.3926931864. The cubic root of 21246501 is about 276.9677094430.

The spelling of 21246501 in words is "twenty-one million, two hundred forty-six thousand, five hundred one".