21748798 has 8 divisors (see below), whose sum is σ = 33382008. Its totient is φ = 10621464.

The previous prime is 21748789. The next prime is 21748807. The reversal of 21748798 is 89784712.

It is an interprime number because it is at equal distance from previous prime (21748789) and next prime (21748807).

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

It is a congruent number.

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, 126361 + ... + 126532.

It is an arithmetic number, because the mean of its divisors is an integer number (4172751).

Almost surely, 2^21748798 is an apocalyptic number.

21748798 is a deficient number, since it is larger than the sum of its proper divisors (11633210).

21748798 is a wasteful number, since it uses less digits than its factorization.

21748798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252938.

The product of its digits is 225792, while the sum is 46.

The square root of 21748798 is about 4663.5606568372. The cubic root of 21748798 is about 279.1333663505.

The spelling of 21748798 in words is "twenty-one million, seven hundred forty-eight thousand, seven hundred ninety-eight".