21498730 has 16 divisors (see below), whose sum is σ = 42215904. Its totient is φ = 7817680.

The previous prime is 21498707. The next prime is 21498733. The reversal of 21498730 is 3789412.

It is a super-2 number, since 2×21498730² = 924390783225800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21498733) 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, 97612 + ... + 97831.

It is an arithmetic number, because the mean of its divisors is an integer number (2638494).

Almost surely, 2^21498730 is an apocalyptic number.

21498730 is a deficient number, since it is larger than the sum of its proper divisors (20717174).

21498730 is a wasteful number, since it uses less digits than its factorization.

21498730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195461.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 21498730 is about 4636.6722981035. The cubic root of 21498730 is about 278.0594131422.

The spelling of 21498730 in words is "twenty-one million, four hundred ninety-eight thousand, seven hundred thirty".