21246497 has 8 divisors (see below), whose sum is σ = 21690240. Its totient is φ = 20807280.

The previous prime is 21246493. The next prime is 21246499. The reversal of 21246497 is 79464212.

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

It is a cyclic number.

It is not a de Polignac number, because 21246497 - 2² = 21246493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21246493) 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, 9323 + ... + 11375.

It is an arithmetic number, because the mean of its divisors is an integer number (2711280).

Almost surely, 2^21246497 is an apocalyptic number.

It is an amenable number.

21246497 is a deficient number, since it is larger than the sum of its proper divisors (443743).

21246497 is a wasteful number, since it uses less digits than its factorization.

21246497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its digits is 24192, while the sum is 35.

The square root of 21246497 is about 4609.3922592897. The cubic root of 21246497 is about 276.9676920618.

The spelling of 21246497 in words is "twenty-one million, two hundred forty-six thousand, four hundred ninety-seven".