21450374 has 8 divisors (see below), whose sum is σ = 35100648. Its totient is φ = 9750160.

The previous prime is 21450367. The next prime is 21450389. The reversal of 21450374 is 47305412.

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, 487487 + ... + 487530.

It is an arithmetic number, because the mean of its divisors is an integer number (4387581).

Almost surely, 2^21450374 is an apocalyptic number.

21450374 is a deficient number, since it is larger than the sum of its proper divisors (13650274).

21450374 is a wasteful number, since it uses less digits than its factorization.

21450374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975030.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21450374 is about 4631.4548470216. The cubic root of 21450374 is about 277.8507816771.

Adding to 21450374 its reverse (47305412), we get a palindrome (68755786).

The spelling of 21450374 in words is "twenty-one million, four hundred fifty thousand, three hundred seventy-four".