21464378 has 8 divisors (see below), whose sum is σ = 34673268. Its totient is φ = 9906624.

The previous prime is 21464371. The next prime is 21464393. The reversal of 21464378 is 87346412.

It can be written as a sum of positive squares in 2 ways, for example, as 20912329 + 552049 = 4573^2 + 743^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21464371) 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, 412751 + ... + 412802.

Almost surely, 2^21464378 is an apocalyptic number.

21464378 is a deficient number, since it is larger than the sum of its proper divisors (13208890).

21464378 is a wasteful number, since it uses less digits than its factorization.

21464378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825568.

The product of its digits is 32256, while the sum is 35.

The square root of 21464378 is about 4632.9664363127. The cubic root of 21464378 is about 277.9112340169.

The spelling of 21464378 in words is "twenty-one million, four hundred sixty-four thousand, three hundred seventy-eight".