21240698 has 8 divisors (see below), whose sum is σ = 31907520. Its totient is φ = 10604860.

The previous prime is 21240697. The next prime is 21240719. The reversal of 21240698 is 89604212.

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 (21240697) 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, 5948 + ... + 8823.

It is an arithmetic number, because the mean of its divisors is an integer number (3988440).

Almost surely, 2^21240698 is an apocalyptic number.

21240698 is a deficient number, since it is larger than the sum of its proper divisors (10666822).

21240698 is a wasteful number, since it uses less digits than its factorization.

21240698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15492.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21240698 is about 4608.7631746489. The cubic root of 21240698 is about 276.9424913304.

The spelling of 21240698 in words is "twenty-one million, two hundred forty thousand, six hundred ninety-eight".