21450974 has 8 divisors (see below), whose sum is σ = 34069248. Its totient is φ = 10094560.

The previous prime is 21450971. The next prime is 21451007. The reversal of 21450974 is 47905412.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21450974.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315422 + ... + 315489.

It is an arithmetic number, because the mean of its divisors is an integer number (4258656).

Almost surely, 2^21450974 is an apocalyptic number.

21450974 is a deficient number, since it is larger than the sum of its proper divisors (12618274).

21450974 is a wasteful number, since it uses less digits than its factorization.

21450974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630930.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 21450974 is about 4631.5196210315. The cubic root of 21450974 is about 277.8533722910.

The spelling of 21450974 in words is "twenty-one million, four hundred fifty thousand, nine hundred seventy-four".