21450798 has 16 divisors (see below), whose sum is σ = 47668560. Its totient is φ = 7150248.

The previous prime is 21450797. The next prime is 21450799. The reversal of 21450798 is 89705412.

It is an interprime number because it is at equal distance from previous prime (21450797) and next prime (21450799).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450797) by changing a digit.

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, 198565 + ... + 198672.

It is an arithmetic number, because the mean of its divisors is an integer number (2979285).

Almost surely, 2^21450798 is an apocalyptic number.

21450798 is an abundant number, since it is smaller than the sum of its proper divisors (26217762).

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

21450798 is a wasteful number, since it uses less digits than its factorization.

21450798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397248 (or 397242 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 21450798 is about 4631.5006207492. The cubic root of 21450798 is about 277.8526123826.

The spelling of 21450798 in words is "twenty-one million, four hundred fifty thousand, seven hundred ninety-eight".