21303798 has 8 divisors (see below), whose sum is σ = 42607608. Its totient is φ = 7101264.

The previous prime is 21303797. The next prime is 21303817. The reversal of 21303798 is 89730312.

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

21303798 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303797) 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, 1775311 + ... + 1775322.

It is an arithmetic number, because the mean of its divisors is an integer number (5325951).

Almost surely, 2^21303798 is an apocalyptic number.

21303798 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21303798 is a wasteful number, since it uses less digits than its factorization.

21303798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3550638.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21303798 is about 4615.6037524900. The cubic root of 21303798 is about 277.2164590257.

The spelling of 21303798 in words is "twenty-one million, three hundred three thousand, seven hundred ninety-eight".