21421498 has 8 divisors (see below), whose sum is σ = 36722592. Its totient is φ = 9180636.

The previous prime is 21421489. The next prime is 21421537. The reversal of 21421498 is 89412412.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765040 + ... + 765067.

It is an arithmetic number, because the mean of its divisors is an integer number (4590324).

Almost surely, 2^21421498 is an apocalyptic number.

21421498 is a deficient number, since it is larger than the sum of its proper divisors (15301094).

21421498 is a wasteful number, since it uses less digits than its factorization.

21421498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530116.

The product of its digits is 4608, while the sum is 31.

The square root of 21421498 is about 4628.3364181961. The cubic root of 21421498 is about 277.7260469119.

It can be divided in two parts, 214 and 21498, that added together give a palindrome (21712).

The spelling of 21421498 in words is "twenty-one million, four hundred twenty-one thousand, four hundred ninety-eight".