21407498 has 16 divisors (see below), whose sum is σ = 36758400. Its totient is φ = 9159696.

The previous prime is 21407479. The next prime is 21407521. The reversal of 21407498 is 89470412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14603 + ... + 16001.

It is an arithmetic number, because the mean of its divisors is an integer number (2297400).

Almost surely, 2^21407498 is an apocalyptic number.

21407498 is a deficient number, since it is larger than the sum of its proper divisors (15350902).

21407498 is a wasteful number, since it uses less digits than its factorization.

21407498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2501.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 21407498 is about 4626.8237485342. The cubic root of 21407498 is about 277.6655311938.

The spelling of 21407498 in words is "twenty-one million, four hundred seven thousand, four hundred ninety-eight".